One of those nights

I can't fall asleep. The longer I'm awake, the more I think about having to get up at 5 a.m. to work out, and the harder it is to fall asleep. I've had many such nights these past few months, which is a complete oddity. Maybe I need to work out everyday, to exhaust myself. Still, I only got a few hours of sleep last night, so I should be out right now. I passed out for about two hours when I got home from work. I think that is the problem.
I keep getting up, reading a while, and then turn out the lights to try and sleep. Lying in the dark, rolling around. It's like drifting alone in a life raft across the ocean. You lift your head up to look around, and you see random pieces of emotional debris and half-contemplated thoughts floating past.