I usually am solving all the problems of the world and a few of my own. My brain will skip around to topics I didn't even know where in there! How about you?
I think I have been blessed with falling asleep and staying asleep.
I have a physical job that lends itself to sleep. But if I have a light day of work I make sure to burn it off in the gym.
If I have trouble sleeping, I try to distract my mind with music or a video or the radio. The only time that I have this issue is when I don't let myself fall asleep naturally, catch a second wind, and find myself wide awake.