Circadian Sleep Disorders Network - Advocating for people with misaligned body clocks
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ON THIS PAGE (links):
What Are CRSDs?
*** Join! ***
Help Spread Awareness
News Items
Election Newsletter
N24 Day: Think Zebras
Board Elections
New Secretary
Circadian Rep Attends SDRAB
Invisible Disabilities Week
Can Chronotherapy Cause Non-24?
Non-24 Calculator
CSD-N Maintains List of Doctors
CRDs in Scientific American Mind
Hetlioz Approved in Europe
Hetlioz Approval Challenged
Non-24 Q&A in Spanish
NIH Strategic Visioning Survey
Non-24 in Sleep Review
CSD-N Comments to AASM
Write NIH To Add DSPD, N24
Archived News
More About Us
Email List
Q&A Docs (FAQs)
Basic Fact Sheet
Start School Later
Amazon to Donate to CSD-N
Websites Link to CSD-N
Recently Added References
  (members only)
Facebook, LinkedIn, Twitter
Media Kit
Our Email Address
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 CSDs) 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.

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.

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 doctor and their general doctor 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 US letter paper (8½x11) or on A4 paper (non--US). Booklets can be printed for DSPS or for Non-24 (the same file can be printed on either US or A4 paper). Alternatively you can email us at to request a printed copy of any or all these documents (please specify which). Be sure to include your name and full postal address. We will send these at no charge to you.

News Items

Election Newsletter

The latest issue of The Circadian, CSD-N's Newsletter, can be viewed for a limited time here. This issue concentrates on the board election, including write-ups by each candidate, and also Non-24 Awareness Day.

N24 Awareness Day: For Non-24, Think Zebras

N24 Day: Think Zebras Circadian Sleep Disorders Network is proud to join the online N24 community in celebration of N24 Awareness day....

This year's theme is Think Zebras. This comes from a saying that doctors are taught: "If you hear hoof beats think horses, not zebras." When faced with symptoms, try to think of the more common causes first and not the rare ones. The patient with cough, fever and lassitude is more likely have the flu than, say, Q fever.

While that's a reasonable rule, if followed too rigidly it leaves people with rare disorders misdiagnosed or undiagnosed. This is often the case with N24. People presenting with the symptoms of N24 are often diagnosed with more common conditions such as insomnia or depression and treated accordingly, usually with bad results. Or, in many cases, their symptoms are not believed or left as a mystery.

Please view the full article here.

Board Elections

Elections for the Board of Directors of Circadian Sleep Disorders Network will be held from Dec 1 through Dec 15. CSD-N members in good standing (i.e. who have paid their dues for CY 2015 or 2016) should receive ballots around Dec 1. Board members serve two-year terms, which are staggered, so half the board is elected every year. There are four slots to be filled.

Three incumbent board members are running again: Peter Mansbach, the current president; Asli Kumcu, and Beth Macdonald. Two new volunteers have been nominated: Eric Oyen and Lily Style. Write-ups submitted by the candidates will be published in the upcoming newsletter, and will also appear on the ballots.

New Secretary

Valerie S Johnson Please welcome Valerie S Johnson, the new secretary of CSD-N. The Board of Directors has appointed Valerie to fill that office after the previous secretary resigned. The Board also appointed Valerie to serve on the board to fill the remainder of the term of the previous secretary, who also resigned her board position.

Circadian Rep Attends SDRAB

Thanks to Susan Plawsky for representing Circadian Rhythm Sleep Disorders at the Oct 9 meeting of the NIH Sleep Disorders Research Advisory Board (SDRAB). Susan was formerly on the Board of Directors of the Circadian Sleep Disorders Network.

She participated in the SDRAB meeting as an "ad hoc" member of the SDRAB. The process for selecting an official circadian member of the SDRAB is ongoing, but in the meantime we have a representative of the circadian disorders community participating on the board. The SDRAB will be revising the NIH Sleep Disorders Research Plan.

Invisible Disabilities Week

Invisible Disabilities Week logo Oct 18 - 24, 2015, is Invisible Disabilities Week, sponsored by the Invisible Disabilities Association. Details available on their website,, Facebook, or Twitter (#InvisibleDisabilitiesWeek).

Can Chronotherapy Cause Non-24?

James Fadden, our vice president, has written up the arguments supporting our concern that chronotherapy (delaying the clock) may lead to Non-24-Hour Sleep-Wake Disorder.

Non-24 Calculator

We've created a new calculator, that predicts both wake times and sleep times into the future, for people with non-24 with a consistent delay. It's at

calculator Let us know ( ) immediately if there are any errors. Suggestions for improvements are also welcome. (Note: the third-party calculator we previously linked to had some serious bugs)

CSD-N Maintains List of Doctors

Find a Doctor! Circadian Sleep Disorders Network is now hosting the "Find a Doctor" page, a list of doctors that patients with DSPD or Non-24 found knowledgeable and helpful.

The information was originally assembled in a wiki by several of our members, from comments sent in by patients. CSD-N was invited to take over maintenance of this page. We believe this can be a useful resource for people looking for a doctor knowledgeable about DSPD and Non-24.

Note that we simply post recommendations we receive from patients. We do not have first-hand knowledge of these doctors, and cannot be held responsible for bad recommendations or errors in posted information.

Let us know if you have additional doctors whom you feel are knowledgeable and helpful regarding CRDs.

CRDs in Scientific American Mind

Scientific American Mind, Sept/Oct 2015 Scientific American Mind has an excellent article, Out of Sync, in its Sept/Oct 2015 issue. It covers DSPD and Non-24, although much of the article is about Sparrow Rose Jones and her struggle with Non-24. Circadian Sleep Disorders Network was contacted for information and references that provided background for this article.

Quoting from the article:

"Honestly, if you ask me, I would prefer to have heart failure than a non-24-hour sleep-wake-cycle disorder," says Robert J. Thomas, a sleep medicine doctor at Beth Israel Deaconess Medical Center in Boston who specializes in circadian disorders. "That's how badly these patients suffer."
Dr Thomas is on the Medical Advisory Board of Circadian Sleep Disorders Network.

Hetlioz Approved in Europe

Vanda Pharmaceuticals Inc. announced (July 7) that the European Commission approved HETLIOZ® (tasimelteon) for the treatment of Non-24-Hour Sleep-Wake Disorder in totally blind adults in the European Union (EU).

Note: Circadian Sleep Disorders Network is not in any way affiliated with Vanda Pharmaceuticals Inc.

Hetlioz Approval for Sighted Non-24 Challenged in U.S.

Background: In Jan 2014 Hetlioz (Vanda's brand name for tasimelteon) received FDA approval for non-24. The FDA-approved prescribing information says simply HETLIOZ is indicated for the treatment of Non-24-Hour Sleep-Wake Disorder (Non-24). There is no limitation to blind people. In October 2014 the FDA clarified its news release approving the drug by eliminating the restriction to blind people, thus making it easier for sighted non-24s to get insurance coverage for this expensive drug.

Now (June 2015) Public Citizen has filed a petition with the FDA requesting that the approval and prescribing information be limited to blind patients without light perception, since it was never tested on sighted people. They also request additional safety information.

Note: Circadian Sleep Disorders Network is not in any way affiliated with Vanda Pharmaceuticals Inc. or Public Citizen.

N24 Q&A in Spanish

Our Non-24 Question and Answer document is now available in Spanish, too. Thanks to member Maggie G for doing the translation, and Lo Bellver, a native Spanish speaker, for reviewing it!

A Spanish translation of the DSPS Q&A was posted recently as well.

If any of you has the linguistic expertise to translate our documents or web pages into Spanish or any other language, please do so. It can help raise awareness in non-English-speaking countries, and provide material for people with circadian rhythm sleep disorders to pass on to their doctors, family, and employers. Send submissions to .

CSD-N Participates in NIH Strategic Visioning Survey

NIH NHLBI logo NIH has asked stakeholders to participate in their Strategic Visioning Survey, to gather ideas for areas requiring (and ripe for) future research and to determine the level of interest. The Sleep Research Society (SRS) contributed a number of entries for sleep research, and CSD-N members added two more. Preliminary voting ended May 15, 2015. These entries are being reviewed, revised, and consolidated by NIH and its advisory boards. Public comments and votes will again be solicited, on the revised entries, from July 1 - Aug 15.

The public forum is at You can see all the sleep-related entries by clicking on Sleep in the right hand column, or by searching for Sleep in the search box at the top. The entries by CSD-N members are:
Improve ineffective treatments for circadian rhythm disorders
Elucidate the different causes of circadian disorders, and tailor the treatment to the cause.

CSD-N alerted its current and recent members of the opportunity to vote.

Non-24 in Sleep Review

distraught man and funny clock The journal Sleep Review has just published an article on Non-24 by our vice president, James Fadden. The web version is up now. A print edition and a digital edition (pdf) are expected soon. Thanks, James, for putting in the work on this, obviously a significant effort.

CSD-N Comments on AASM Guidelines

Circadian Sleep Disorders Network has submitted its comments to AASM on their draft Clinical Practice Guideline for the Treatment of Intrinsic Circadian Rhythm Sleep-Wake Disorders. A number of our Board members contributed to these comments.

We would have preferred more time for discussion, but we wanted to submit what we had by the May 12 deadline, in order to raise some of our concerns and be part of the discussion.

Write NIH To Add CRSDs To Their Website

NIH has still not included DSPD or Non-24 on their website!

The U.S. National Institutes of Health (NIH) has a number of web pages which talk about sleep disorders. In all these pages we see sleep apnea, narcolepsy, and restless legs; but we do not see any Circadian Rhythm Sleep Disorders - no Delayed Sleep Phase Disorder, no Non-24-Hour Sleep-Wake Disorder. It's no wonder people haven't heard of these disorders, and many doctors still don't recognize how serious they are....

Instructions and sample email are at . Send email to, and please copy CSD-N at, so we can follow up, possibly including contacting higher ups.

I received this email from the NIH NHLBI Health Information Center in response to the above campaign. It represents good progress. Dr Twery took action in response to our emails by raising the issue with the Information Center. He passed the emails on to them, and they are aware of our issues. He did advise me that it's a slow process, and will take a long time. In my opinion, it would still help if more people wrote to him, since we are competing for very limited funds. Together we have a voice! Thank you.

Archived News

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 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.

Our Brochure

image of brochure cover Our brochure is geared to the general public, to introduce 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 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 DSPS and the other for Non-24:

DSPS 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    

Our Basic Fact Sheet

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

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 select a charity. Please enter Circadian Sleep Disorders Network. 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 our first contribution check from Amazon! Please select Circadian Sleep Disorders Network as your charity.

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

Websites Link to CSD-N

We have asked other sleep- and health-related web sites to add a link to the CSD-N website, so interested people could learn more about circadian sleep disorders. That also helps our search ranking, making it easier for others to find us. Sites which have linked to us include:

In addition,, which was no longer being maintained, now forwards their traffic to us.

You can help: email other websites with a request to link to Circadian Sleep Disorders Network at Please use this primary address when suggesting links, not the shortcut.

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 CSDs, 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.


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© 2015 Circadian Sleep Disorders Network
Last modified Nov 27, 2015
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