Why does it feel like my heart just got ripped out?

First week of school was pretty good. I haven't really been sleeping though which is a downside. I just lay in bed and toss and turn. I have no recollection of ever sleeping. I'll glance over at my ipod to discover that it's already 6. For some reason, last night, I had the most terrible sleep. I was violently tossing and turning as if I was really upset and frustrated about something, the odd thing is that I don't even understand why. Nothing prior to that made me upset. Also I need to work on the no more naps right after school thing. It's ruining my sleep schedule.