Light therapy at night? Why do that? That may be messing you up. try doing it in the morning. Do you drink cofee, tea, or soda or anything else that has caffeine? If you fall asleep at 9 pm and wake up at 4 am, then don't try to go back to sleep, but instead try to stay up to at least 10 pm the next night, then 11 pm the following night until you get you sleep patterns the way you want them. It might mean going a night or two of less sleep than normal to straighten out the pattern.