I sometimes have that problem too. The worst time one once that I kept trying to sleep but kept thinking about what you needed to do in order to fall asleep. I started breathing and and out and doing things I generally do, but I wouldn't fall asleep(I guess I didn't let my consciousness go, what is what I was really supposed to do). I stayed up until 5am until I finally fell asleep(I went to be like at 12 that day)...

Also Joe, I have that problem many times, where a song keeps on playing on my head. I can make it stop but it just keeps coming back...after much trying it just goes away for good(I generally substititute it for another and then this one fades itself away )