Do I have Insomnia? I think I have some sort of sleep problem.?

[greekydudesshadow]

I usually fall asleep fine, but I almost always wake up in the middle of the night no matter how tired I was when I fell asleep (this happens multiple times a night). Because of my schedule I don't get much sleep, but on the weekends when I try to "catch up" the sleep that I've missed I still wake up multiple times in the middle of the night, if not than I still wake up far too early for how tired I feel. Basically I can fall asleep fine, but I can't stay asleep.