Cant sleep!

For some reason, i could not really sleep. I dont know the reason though. I never had any caffein today that will trigger this problem of mine. I have been two nights already that i woke up like 3 o clock in the morning and could not go back to bed. my head is hurt and really wanted to rest but my mind wont stop thinking of nonsense things. Well, maybe after making my task online my mind well get tired and will be able to give my body even a few hours of sleep.