Circadian Sleep Disorders Network - Advocating for people with misaligned body clocks
Printer-friendly page
ON THIS PAGE (links):
What Are CRSDs?
*** Join! ***
*** Take the Survey! ***
Find a Doctor
Help Spread Awareness
News Items
NIH Sleep Research Plan
Board Member Talk on DSPD
Board Election
Nov. 24 is Non-24 Day
Seeking Candidates for Board
Happy 10th Birthday
Night Girl Finds Day Boy
AASM: Sleep Is Essential
SLEEP2021 Conference
Board Member Interviewed
Seeking People To Interview
CSD-N Board Member on Twitter
CSD-N Board Member Speaks
CSD-N rep on Vice News
White Paper on CRD Research
Archived News
More About Us
Email List
Q&A Docs (FAQs)
Basic Fact Sheet
Start School Later
Amazon to Donate to CSD-N
Recently Added References
Facebook, LinkedIn, Twitter
Media Kit
Our Email & Office
The shortcut also gets you to this page, with less typing!
But don't forget the hyphen!

Our Mission

Circadian Sleep Disorders Network is an independent nonprofit organization dedicated to improving the lives of people with chronic circadian rhythm disorders.

We aim to increase awareness within the medical community and among the general public, to provide emotional support and practical ideas for people living with these disorders, to inform patients and health care providers about treatment options, to encourage research into circadian rhythms, and to advocate for accommodations in education and employment for people with circadian rhythm sleep disorders.

Note that Circadian Sleep Disorders Network is not affiliated with any pharmaceutical, medical device, or other company.

What Are Circadian Rhythm Sleep Disorders?

Circadian Rhythm Sleep Disorders (CRSDs or CRDs) are neurological disorders in which the sleep-wake cycle is out of sync with the day-night cycle. These include in particular Delayed Sleep Phase Disorder and Non-24-Hour Sleep-Wake Disorder. Also included are Advanced Sleep Phase Disorder, Irregular Sleep Wake Disorder, and Shift Work Disorder, which are defined here.

Delayed Sleep Phase Disorder (DSPD), also called Delayed Sleep Phase Syndrome (DSPS), is characterized by an inability to fall asleep until very late at night, with the resulting need to sleep late in the morning or into the afternoon. Questions? See our DSPS Q&A.

Advanced Sleep Phase Disorder (ASPD), also called Advanced Sleep Phase Syndrome (ASPS), is the opposite. It is characterized by falling asleep very early in the evening, and waking up in the wee hours of early morning, unable to sleep further.

Non-24-Hour Sleep-Wake Disorder (Non-24), also called Free-Running Disorder (FRD), is a condition in which a person's day length is significantly longer than 24 hours, so that sleep times get later each day, cycling around the clock in a matter of days or weeks. Questions? See our Non-24 Q&A.

Some people use the term reverse sleep, referring to the fact that sometimes people with DSPD and Non-24 end up sleeping during daylight and being awake at night.

Please refer to our descriptions, definitions, and treatments pages for more details, and print out our brochure, fact sheet, and/or Q&A documents to give to others.

Become a Member! or Renew Now!

We can progress toward our mission of promoting awareness and accommodation only if we can demonstrate that we represent a community of people who suffer from these disorders. Please join now, so we can better help you and the CSD community in achieving our common goals. Together we have a voice! More details are on the Join page.

Last year's members: if you haven't renewed yet, please do so now. Renew now!

We are a 501(c)(3) organization based in the U.S., serving the global circadian sleep disorders community. We are a patient organization, entirely supported by member dues and contributions. We are all unpaid volunteers.

Take Our Survey!

Circadian Sleep Disorders Network has launched its PATIENT POWERED REGISTRY AND SURVEY for people with Circadian Rhythm Sleep Disorders. The registry is open to anyone with a circadian rhythm sleep disorder from any country. You can sign up for the registry and take the survey (it's free) at

By collecting information from a large number of people actually suffering from these disorders, we can stimulate research into causes, treatments, and effects of circadian disorders.

We often complain that so little research has been done on people suffering with Circadian Rhythm Sleep Disorders. One reason is the difficulty researchers have in locating people with these disorders. Well, this is your chance! You can make a difference!

The information you provide can jump-start research on some of the questions we've been asking about for years - but only if enough people participate. You can also optionally allow researchers to contact you to participate in studies. Sign up now (free), and please take the survey.

Note that the signup questions that you get first are not the survey! Part of the signup process with Invitae (the registry host, formerly AltaVoice) involves answering two pages of demographic questions like age, gender, race, etc. This is not our survey.

After you've finished signing up you will be taken to our survey, called "Circadian Rhythm Sleep Disorders", which asks about your circadian disorders, sleep habits, treatment, and other disorders. Our survey has multiple pages. The actual number is dependent on how you answer some key questions. Please be sure to complete the entire survey. Otherwise, your responses will not be used in analysis.

For more information, and to review the survey instructions and definitions, click here.

Researchers: You can view the survey questions without taking the survey here. You can request participants to contact you for further research by contacting Invitae PIN (Patient Insights Network) (website) or emailing Circadian Sleep Disorders Network at for further information.

Help Us Spread Awareness

image of brochure cover We are asking our members and followers to give our brochure, and/or our Q&A booklets, to their sleep doctors and their general doctors on their next visits. It is vital to all of us suffering from circadian disorders that more doctors and their support staff understand these disorders and how disruptive they can be. The more doctors who know about us, the more patients we can reach, inform, and support. And the larger our membership, the more credible our voice on behalf of all people with circadian sleep disorders.

You can print out the brochure on U.S. letter paper (8½x11) or on A4 paper (non--U.S.). Booklets can be printed for DSPS or for Non-24 (the same file can be printed on either U.S. or A4 paper). Alternatively you can email us at to request a printed copy of any or all these documents (please specify which, and how many you really need). Be sure to include your name and full postal address. We will send these at no charge to you.

News Items

NIH Sleep Research Plan Released

NIH Sleep Research Plan

Dec 13, 2021
The National Center on Sleep Disorders Research, part of the U.S. National Institutes of Health (NIH), announces the release of the 2021 NIH Sleep Research Plan. This new research plan presents a comprehensive approach to addressing the critical research needs and opportunities in sleep and circadian biology.

The plan was developed with input from the public, scientific communities, the Sleep Disorders Research Advisory Board (SDRAB), the NIH Sleep Research Coordinating Committee, NIH leadership, and partners across the Federal government, with the goal of advancing sleep and circadian research that improves medicine, public health, and the safety of the nation.

Many thanks to Susan Plawsky for ably representing Circadian Sleep Disorders Network on the SDRAB through four years of painstaking work, despite all the bureaucratic wrangling over wording and the compromises required.

Tune in to NIH's LinkedIn Live Event on Thursday, December 16, 2021 beginning at Noon ET to ask questions about the new plan.

Board Member Talk on DSPD

Alexandra Wharton

Nov 2021
Alexandra Wharton, CSD-N board member and social media liaison, gave an introduction to DSPD at Project Sleep's Sleep Advocacy Forum on Oct 18, 2021. The forum brought together a group of policy makers and sleep advocates to share information on timely topics from medical research to public health and patient care issues.

Alexandra gave an overview of Delayed Sleep Phase Disorder. You can view her talk here.

Board Election

Nov 2021
There are four vacancies on the Board of Directors. Two incumbents, Samuel Bearg and Peter Mansbach, are running again. Two new people, Sabrina DeAngelis and Sarah Hazelwood, have also asked to run and have been nominated by the Board.

Since there are only four nominees for the four vacant slots, we do not need to hold a formal vote of the membership. The new board members will begin serving on the board on Jan 15, 2022.

Nov. 24 is Non-24 Awareness Day

Non-24 Day logo Nov 24, 2021
Non-24-Hour Sleep-Wake Disorder (Non-24) is a serious disorder of the body's circadian system, in which a person's clock runs (generally) much longer than 24 hours and they are unable to entrain to a 24-hour daily cycle. Instead, their sleep time progresses later and later each day, going all the way around the clock. It is also called Free Running Disorder. Without proper treatment the person is unable to meet regular daily commitments and so, without suitable accommodations, unable to hold a normal job, so this is a real disability. And in many people the current treatments are ineffective.

Talk to someone about it! Raise awareness! Explain what it is, that it affects sighted as well as blind individuals, how it impacts people's lives, that it is physical and is reflected in people's biomarkers, and that treatment often does not work.

CSD-N Seeks Candidates for Board

Oct 2021
Circadian Sleep Disorders Network will be holding elections for its Board of Directors, and is seeking some new faces. Requirements are described in Meetings are held by online forum, so you can log in at any time of day to read what's been posted and post your replies. Meetings do continue for two months or more, though often not very actively.

If you're interested, please let us know soon (latest Nov 10), following the instructions at the end of the above document. Directors start serving January 15, 2021. Terms generally run for two years.

We are also often looking for other volunteers willing to help. These can be board members but do not have to be. If you're interested in volunteering, please let us know.


Happy Birthday

Aug 2021
CSD-N incorporated Aug 18, 2011, and has been going strong since.

Amazon Modern Love ad

The Night Girl Finds a Day Boy

Aug 2021
The Night Girl Finds a Day Boy - a true story about a person with extreme DSPD and a normal-time sleeper falling in love and making it work - is now available on Modern Love (Season 2 Episode 2) on Amazon Prime video.

The original text story, by Amanda Gefter, is behind a NYTimes paywall (with some free viewings) but is available in podcast form (no paywall).

There is a new interview with the author, "night girl" Amanda Gefter, but it's behind the NYTimes paywall (although you may get a free view, if you don't use NYTimes very often).

AASM logo

CSD-N Joins AASM Saying Sleep Is Essential

June 2021
Circadian Sleep Disorders Network is a signatory on the just released AASM position paper "Sleep is essential to health: An American Academy of Sleep Medicine position statement." Lots of good proposals and conclusions, including "Healthy sleep requires adequate sleep duration, appropriate timing, regularity, the absence of sleep disorders, and good quality..." [emphasis added].

SLEEP2021 Conference

SLEEP2021 Conference logo

June 2021
CSD-N President Peter Mansbach "attended" (virtually) the SLEEP2021 conference presented by AASM and SRS from June 10 - 13 . Some takeaways are described here.

Samuel Bearg

CSD-N Board Member Interviewed

June 2021
CSD-N board member Samuel Bearg was recently interviewed on Handi-Link about his CRD and CRDs in general. Check it out here. (Listen to the "modified" version, which corrected an error in our name.)

CSD-N Member Seeks Study Paricipants To Interview

May 2021
One of the earliest members of CSD-N is working on his PhD and seeks people willing to be interviewed. He writes:

I am a PhD student at the University of Leeds seeking to recruit people with diverse sleeping times or diagnoses of a circadian rhythm sleep disorder to interview about the social and historical development of our knowledge about circadian rhythms and their disorders....

The interviews will take up to one hour and be conducted online or by telephone at flexible times to suit participants. The interviews will broadly cover your experiences and understandings of sleep timing, the various ways in which sleep timing may be controlled and the role of sleep timing in society.

If you are interested in participating or have any questions, please read the attached information sheet or contact me at

This study has been reviewed and received a positive opinion from the Faculties of Business, Environment and Social Sciences Research Ethics Committee, 22nd March 2021, reference: AREA 20-075.

Thank you for your time,
Jonathan Hume
PhD Candidate
Centre for Disability Studies
University of Leeds

We urge you to contact him to be interviewed.

Rachel Amon

CSD-N Board Member hosts on Twitter

May 2021
CSD-N Board member Rachel Amon hosted @WeAreDisabled on May 3 on Twitter. She explained DSPD and referred people to our website for more information. View the Twitter session here.

CSD-N Board Member Speaks at Orphan Drug Conference

Andrew Cowen at the Orphan Drug Conference April 2021
CSD-N board member Andrew Cowen gave a talk at the Orphan Drug Conference on April 28. He explained Non-24, and talked about the difficulty of obtaining Hetlioz and insurance coverage for it. You can view a recording here.

CSD-N Board Member on Vice News

Alexandra Wharton on Vice News March 2021
CSD-N board member Alexandra Wharton was interviewed on Vice News on March 15. She talked about her experience with DSPD, and the particular difficulty of shifting the clocks an hour ahead when we switched to daylight saving time the day before. Watch this segment on Youtube.

CSD-N Contributes to Influential White Paper

SRS & SRBR logos March 2021
The Circadian Sleep Disorders Network (CSD-N) contributed to a white paper that was recently published in the prestigious journal SLEEP. Authored by leaders in the field of circadian medicine, this paper has the potential to influence the direction of research on circadian rhythm sleep-wake disorders (CRSWDs).

Workshop report. Circadian rhythm sleep-wake disorders: gaps and opportunities identifies gaps in the diagnosis and treatment of CRSWDs and defines areas of urgently needed research.

The paper presents the results from a workshop cosponsored by the Sleep Research Society (SRS) and the Society for Research on Biological Rhythms (SRBR). CSD-N contributed through our detailed Needed Research document, which is listed as Reference 16 in the white paper.

This review of the many gaps in our knowledge of CRSWDs is timely in light of the increased attention to circadian rhythms in many areas of medicine, and is so welcome to the many patients with these disorders for whom the current treatments fail.

We are generally pleased that many of the points we made in our Needed Research document were, in fact, included in this report. It clearly underscores the poor understanding of causes of these disorders, the absence of good diagnostic biomarkers, and the lack of effective treatment. It acknowledges inconsistent definitions of the disorders, and lack of good data on prevalence. Numerous other issues of concern to us have also been included.

Three points, however, we wish had been made more clearly: First, the need for patients' subjective improvement - not just laboratory measurements - in evaluating treatment success is mentioned, but only once. Second, while the white paper acknowledges the likelihood of different subtypes of CRSWDs with different underlying causes, and also acknowledges that efficacy of existing treatments is not well understood, it doesn't seem to clearly make the connection that the different subtypes likely require different treatments — and therefore any one treatment would exhibit low success rate when applied to the entire patient population. Finally, it doesn't seem to acknowledge that so many DSPWD patients are still tired, even while sleeping according to their body's internal clock.

CSD-N wishes to thank its patient community for their comments on social media, which informed our Needed Research document and from there the white paper. Thanks also to the workshop participants for including our viewpoint, and Dr Elizabeth B Klerman who contacted us and was our liaison to the workshop. Dr Klerman is also a member of the CSD-N medical advisory board.

Archived News

Archived News 2020
Archived News 2019
Archived News 2018
Archived News 2017
Archived News 2016
Archived News 2015
Archived News 2014
Archived News 2013
Archived News 2011 - 2012 (incomplete)

More About Us

Niteowl Email List

This is a free mailing list support group for people with DSPS and Non-24 to share their experiences. It's a good place for people just discovering these disorders to hear how others deal with them, as well as for long-time participants to get support and to provide support to others. There are often discussions of evolving treatment, useful to all. For further information, and to sign up, go to

Note that membership in Circadian Sleep Disorders Network and membership on this email list are completely separate.


Circadian Sleep Disorders Network is affiliated with this email list, and our volunteers assist the list administrator with some chores. CSD-N was formed by participants on this list, and many of our members post regularly. But we have no control over what appears or who can join, and list membership is completely separate from membership in CSD-N.


Once you've signed up for the list, you post by sending an email to Everyone on the mailing list receives that post as an email, and you receive everyone else's posts as emails. If you don't like to get separate emails, you can opt to receive in digest form, typically one email a day containing all the day's posts. You make that selection after signing up by logging in (using the password you created when signing up for the email list) at


There are some rules:
The rules that the list software enforces are

One frequent problem is that people with more than one e-mail account try to send from an address that isn't registered as a member here. An infrequent problem is that a few e-mail providers aren't accepted at all so another e-mail account must be (acquired and) used. gmail generally works well.

An additional rule is PLEASE do not just reply to a message with a subject line containing "Niteowl Digest, Vol xxx, Issue xxx". That is obviously not informative and if you aren't careful you may include the whole list of messages in the Digest, making your message too large for the list.

Digest or not, it is a good idea to trim whatever you are replying to leaving just enough for people to know what you are replying to.

Of course, don't be snippy or insulting, and please take off-topic conversations off-list. And no advertising.


Once you've signed up for the list, you can also browse previous posts in the archive at

There is also a mirror of the archive on Yahoo at This is useful when the primary archives are not working, as sometimes happens. Login to your Yahoo account, or create one (free) - link is at the top right on that page. Then you have to join the Yahoo copy of the list - this is separate from signing up for the list itself - there is a button on the Yahoo page to do this.


To unsubscribe from the Niteowl email list go to
and follow the directions at the bottom of the page. You will need to know your list password.

If you do not know your list password, send email to
with PASSWORD in the subject line. This email must come from the same email address that you subscribed from (which is the one your incoming Niteowl list emails go to). Your password will be sent to you at that address.

If that doesn't work, you can unsubscribe by sending email to
with UNSUBSCRIBE in the subject line. This email must come from the same email address that you subscribed from (which is the one you your incoming Niteowl list emails go to). If you do this, you will get an email back asking you to confirm. You must follow the instructions and confirm, or you will not be unsubscribed.


For more (or more current) help on list commands, send email to
with HELP in the subject line.

Our Brochure

image of brochure cover Our brochure is geared to the general public, to introduce DSPD (DSPS) and Non-24 to people experiencing symptoms of these disorders, and to their families. Please distribute it to anyone who may be interested. Print on lightly colored paper for some color, if you like. We used ivory.

Brochure - web display     Print on US letter size paper, PDF
Print on A4 size paper, PDF

The web display version shows the brochure panels in easy-to-read order. The print versions are meant to be printed out on both sides of a sheet of paper, then folded in thirds, creating a brochure. (In the print version, the panels will appear out of order on-screen.)

Our Q&A Documents (FAQs)

We have posted documents describing DSPD (DSPS) and Non-24, in an easy to read Question-and-Answer format. These are designed to give to family members, friends, employers, and school personnel, to help them understand these disorders. Feel free to print and distribute these. There are two different (but similar) versions, one for DSPD and the other for Non-24:

DSPD Q&A - web     printer     booklet*
Non-24 Q&A - web     printer booklet*

The web formats display nicely in your browser. The printer versions are formatted by your browser for printing a multi-page document. The booklet forms are pre-formatted PDF files that you can print on two sides of a single sheet of paper, which then folds in half into a booklet.
* When printing the booklet, be sure to flip on the short edge (select this option if you have a double-sided printer).

In Other Languages:

Spanish:     DSPS Preguntas y Respuestas - web     printer    
     No-24 Preguntas y Respuestas - web     printer    
German:     DSPS F&A - web     printer    
     Non-24 F&A - web     printer    

Our Basic Fact Sheet

We also have a one page Basic Fact Sheet that introduces DSPD and Non-24 to people who don't know about them. It's a quick and easy read, just the basics.

Our Infographic

infographic thumbnail Former board member and artist Lily Style has created an infographic describing Circadian Rhythm Sleep Disorders. View it in your browser at Feel free to repost the graphic to help raise awareness.

You can print it directly from your browser (we suggest making the browser window full screen - the image will resize). We are also posting JPG images in various proportions for printing directly on different sizes of paper:

You can download these (in Microsoft Windows, right-click and select Save As). To print in Microsoft Windows, right-click on the downloaded file (in File Explorer) and select Print. Or open it in a photo- or image-processing program to use that program's features such as borderless printing.

CSD-N Merchandise

CSD-N mug We are offering merchandise (mugs, T-shirts, tote bags, bumper stickers, and a messenger bag) with our name and logo through CafePress, at (Note: if you just search CafePress you will find this merchandise, but at a higher price!)

Start School Later

Circadian Sleep Disorders Network is a Coalition Partner of Start School Later. We understand only too well the difficulties many teens have with early school start time, and we support the move to start school later.

Amazon Will Donate Part of Your Purchase to CSD-N

Circadian Sleep Disorders Network

The first time you go to you will be asked to confirm Circadian Sleep Disorders Network as your charity. Amazon will remember your selection. But you do have to go to instead of simply, for each purchase, if you want 0.5% of that purchase to go to CSD-N. Note that you pay the same amount either way - through Smile the 0.5% goes to us, otherwise it goes to Amazon.

We have already received several contribution checks from Amazon! Please select Circadian Sleep Disorders Network as your charity.

Also available on the the Amazon Shopping app on your phone. How it works there:

  1. Open the Amazon app on your phone
  2. Select the main menu (=) & tap on "AmazonSmile" within Programs & Features
  3. Select "Circadian Sleep Disorders Network Inc" as your charity
  4. Follow the on-screen instructions to activate AmazonSmile in the mobile app

Amazon and the Amazon logo and AmazonSmile and the AmazonSmile logo are trademarks of, Inc. or its affiliates.

Recently Added References

This is a list of refences added to our Info page since the last newsletter. The newsletter lists references added since the previous newsletter. These are generally available to members only.


This web site is intended to provide generic information about Circadian Rhythm Sleep Disorders, and is not intended to replace discussions with a healthcare provider. You should not use the information on this website for diagnosing or treating a medical or health condition. All decisions regarding patient care should be made with your healthcare provider.


Office: 4619 Woodfield Rd, Bethesda, MD 20814
Phone: By appointment only, please.

browser: CCBot/2.0 (

© 2022 Circadian Sleep Disorders Network
Last modified Dec 13, 2021
Problems: contact