Yes, think about that caffeine.

Often when I can't sleep, it's because I am hungry or I'm cold. Sometimes I don't really feel hungry or cold, but that's the reason.
When I have a snack or put on another blanket, I go right to sleep. On a chilly night, a blanket of real wool makes a difference.


When all else fails, read P.G. Wodehouse, taking time to notice the amazing sentences, the hidden jokes, and occasional poem tucked into the narrative. Works for me.