Recommendation: do a search for Circadian Rhythm Disorder (CRD) as well as Delayed Sleep phase syndrome. The Wikipedia articles are very good and up to date on most of the research. Also, please do take the advice to see a sleep specialist. But make sure the sleep specialist knows about and treats CRD. Most don't! And in my experience very few Doctors are aware of the disorders. the following support group has most of the knowledge on these disorders. you can also search the groups archives. If you start a sleep chart (you will need it for the Sleep specialist), the group members are happy to interpret it for you and will share experiences. The group has helped me tremendously. B