Years of sleeping problems

Hello,
for five or six years now I've had massive issues with my sleeping off and on. I've been diagnosed with Circadian rhythm sleep disorder, meaning that my internal clock isn't what it should be. Treatment is melatonin and/or light treatment, none of which worked. I've tried every single sleep hygiene tip that's out there, and now given up. I'm tired of not having functioning sleep, and I was hoping you could have any ideas.

The problem has been different, sometimes extremely little sleep (1-4 hours a night for six months) where I was simply unable to fall asleep at the correct time. I always started waking up in the evening, making it impossible to sleep. Since I had to get up at 5 in the morning for school at that time, sleep was scarce. I completely collapsed and flunked out of school after that, and I feel I haven't really recovered since. Some months i can't sleep more than four hours at the time, sleeping several times during a day. Some months I seem to have a normal sleep, where I feel I can function pretty well. Now, for quite a few months, I've been unable to function during the day unless I have 10-16 hours sleep. If i have any less, or more, I'm tired and drowsy all day and my mind just doesn't function. Needless to say that any attempt on a normal life with this sort of sleep pattern is rather difficult. It doesn't help that I'm awake most of the night, and sleep most of the day. I'm lucky if I get to the store.

I also get extremely tired very easilly, and if I have an early appointment that only lets me sleep for about 5-6 hours (which should be sufficient for a normal person) I'm knackered for days.

I don't drink caffeine anymore, I gave it up in hope of improvements. There hasn't been any so far. I don't smoke, drink or do any drugs, except for prescribed medicine. I've been on and off on sleep medication (I'm afraid of getting hooked). I'm thinking that it might have somthing to do with my recent asperger diagnosis.

Sorry for the long post. I really hope someone out there could have any ideas.