The Circadian Sleep Disorders Network (CSD-N) has created an excellent visual graphic of what these sleep disorders are.
SHC is a big fan (and member) of the CSD-N. This independent nonprofit organization—unaffiliated with any pharmaceutical, medical device, or other company—is dedicated to improving the lives of people with chronic circadian rhythm disorders.
While the CSD-N is a US-based nonprofit patient organization, it serves a global circadian sleep disorders community.
The organization is entirely supported by member dues and contributions and the leaders are all unpaid volunteers.
They exist to increase awareness about circadian rhythm sleep disorders both within the medical community and among the general public.
The CSD-N board is itself composed of members who suffer from these challenges, so you can expect them to provide emotional support and practical ideas for others living with these disorders.
These efforts include patient and healthcare provider treatment education, support for circadian system research, advocacy for workplace and classroom accommodations for those suffering from circadian rhythm sleep disorders, and their free NiteOwl mailing list support group, especially helpful for people with DSPS and Non-24.