Sleeping Troble

I find getting to sleep a real struggle. Nearly every night I takes me at least 2 hours to fall asleep. Even when I go to bed really late and I mean really late, we are talking staying up for 24 hours, I still cant get to sleep immediately, even though i'm tired. The bad thing is once I do get to sleep I find waking up a real hassle. The problem is when I first wake up I can fall straight back to bed very easily, why is this?