I sleep in shorts every night. Typically a pair of soft Nike gym shorts. I have done so for more years than I can remember. I wake up in shorts every morning. Same shorts typically.
The girl I had over had left before I went to bed and I locked the door. This morning I open my eyes and after a moment to get my wits about me realize I am naked.

I do a quick inventory of all bodies in bed with me. I am alone. I sit up and my shorts are shoved down in the covers at the foot of my bed. I feel.... dirty.

Before anyone asks, I live alone. No male roomates with

tendencies.
I went to bed sober and alone.

I have no explanation. I would hope that any erotic dream I may have had that would make me do this would be remembered but I don't recall any dreams.
Anyone else deal with a problem like this? Is there a name for it?