” Delayed sleep phase syndrome results from a disturbance between the patient’s internal biological clock and the external environment. Again, unlike jet lag, this desynchronization is not activated by travel or change in external environment. Rather, the patient’s propensity to fall asleep is simply “delayed” in relation to that of the general public. Subsequently, a patient who is experiencing DSPS is out of phase with the routine that governs most of his or her life.

A person with this disorder is typically unable to fall asleep before 2 a.m. and has great difficulty waking early, say by 7 a.m. These people are sometimes called “night owls” or described as “not being morning people.” If allowed to sleep a full seven to eight hours, i.e. until 10 a.m., they feel rested and function normally.”

http://www.sleepdisorderchannel.net/dsps/

sounds exactly like me. hmm. better look into this more.