Sleeping issues..

It seems like every night I go to sleep around 11 and will sleep like a rock until 1-2 then I'll wake up wide awake.. I usually get sick a couple times then I'll fall back asleep around 5. But then I won't wake up until 3 that afternoon and if I wake up before then I'm just rude and horrible to be around... Is there anyway to make me sleep all night and wake up at atleast a semi normal time?? I can't get anything done that i need to since I go to work at 5...