1. Patient has chronic difficulty falling asleep at desired time to meet their daily schedules - work, school, etc. Typically patient reports inability to sleep before 2 to 6 am.
2. The patient reports having dealt with these symptoms for at least six months, mostly for multiple years.
3 When not required to maintain their schedule--i.e. weekends, holidays, etc.--patient sleeps without difficulty, and will awaken spontaneously after a sleep period of normal length.
For reference, according to http://www.end-your-sleep-deprivation.com/delayed-sleep-phas... these are the official criteria for diagnosing Delayed Sleep Phase Syndrome:
1. Patient has chronic difficulty falling asleep at desired time to meet their daily schedules - work, school, etc. Typically patient reports inability to sleep before 2 to 6 am.
2. The patient reports having dealt with these symptoms for at least six months, mostly for multiple years.
3 When not required to maintain their schedule--i.e. weekends, holidays, etc.--patient sleeps without difficulty, and will awaken spontaneously after a sleep period of normal length.