I do the same thing. When that happens, I try to find some sort of distraction to keep my mind occupied until I'm ready to go to sleep. Music is usually pretty good for me, as well as watching some TV or getting on the internet. I usually don't have people to talk to when it happens, so I have to figure it out on my own and deal with it as best I can. Writing down your thoughts on paper is also good too. It'll clear your mind.