Is anyone else's sleeping cycle messed up... and not b/c of our DC?

Ok so really... I can't fall asleep before 1.... I am awake at 330, then again at 530, and then last when DD wakes me....

Um yeah... I'm kinda tired! And I've been this way off and on since I was PG (but you understand why during PG lol)....

If I take a tylenol PM... I'm groggy unless I sleep 10 hours.... I can take a melatonin which will keep me asleep, but I just don't understand why I can't stay asleep w/o taking any herbs....