Sleep deprivation.

For some reason being extremely tired makes me horny as all fuck. I'm not sure that I have the wherewithal to actually have decent sex, but when I'm running on 90 minutes of sleep I think about sex more than anything. Certain memories always seem to come up and roll around in my mind when I'm exhausted, and I can feel it in my whole body. I want to have my nipples pinched, I want to be shoved to my knees with a cock stuffed in my mouth, I want come on my face, I want to be bitten and slapped, and I want to be fucked so hard it hurts.

Meanwhile, what I need--and the only thing I'm realistically capable of--is crawling into bed and collapsing.

It's the memories, more than anything. When I'm very tired everything has the flavor of a dream, and memories become immersive, not distant pictures but something I can feel under my skin. The little flashes--a hand holding my hair, a cock between my asscheeks, fingers sliding into my pussy, a mere word a man said to me--are enough to make me flush and shiver.

I almost never have sex dreams. I have a lot of almost-sex dreams: I'll be cuddling with someone, we'll get naked, we'll be talking about sex, and it'll never happen. For whatever reason, when I'm genuinely dreaming I tend to blueball myself. (Also, there are a lot of sharks. Not quite sure why.) But when I'm awake and yet close to sleep, when the membrane of reality has worn thin, just to think of fucking is to experience it.

And I think of fucking a lot.