So this is how it goes...

I am tired all the time.
At night I can't get to sleep til like, 3am or later.
I am able to sleep a full 12 hours sometimes.
When I fall asleep, I either can only sleep for like, at most 2 hours, or for 8-12 hours; so really its little sleep, or alot of sleep.

Is this..well, not normal, but healthy??