Hmmm.. I know this thread is old, but I'm a newb and not yet ready to sleep. >.>

I'm not sure if this is STILL a problem for you, but it seem's like a habit you've developed.. o_o
Since you don't have trouble falling asleep.
Your internal clock is out of whack, try breaking the cycle slowly.
For example, instead of going to bed at 3 A.M, try doing so at 2 A.M and decrease the time every 2 days or so by 30 minutes, until you've reached a desired time. (make that your bedtime)

You also said that you don't "stay asleep" this is the tricky part.
I don't know the circumstances (like it could be that you use the bathroom often, or you wake up at a specific hour everyday.etc)
So I'd suggest that you adjust your sleep pattern and stick with it.

Lol thanks. but for now, I've been staying up 30-40 hours, then sleeping 10-20 hours.
So yeah, AM and PM don't really make a difference now, unless I have to go somewhere.