(Posts may be scarce for a few days, I'm moving and stuff's all crazypants.)
When I'm tired enough, sex is sometimes not exciting but soothing--sometimes very soothing, like the perfect way to drift off to sleep. Not hard fast sex, but slow sleepy sex is positively lulling. And napping together is a whole new kind of intimacy, one that's harder for me to relax for than just sex. I can fuck a guy I don't totally trust, but if I try to sleep with him I'll be awake or barely dozing all night; I have to really trust someone to be able to fall all the way asleep.
Alone, I find that a vibrator helps me sleep. On the lowest setting, just holding it still, it doesn't make me come but it makes me comfy. It's sort of embarrassing to wake up with the cord wrapped around me and the vibrator wedged into the small of my back, though. A few times it's still been going.
Man. Can you spot the subtle hints in this post that I just switched to graveyard shifts? I'm going to take a nap now.