I had the weirdest thing happen to me last night.
I was sleeping on my side with my arm tucked under my head. I woke up, rolled over, and stretched my right arm. Then I reached over with my left hand and felt something warm. My hand was raised, so I was terribly worried about why there was a mystery hand in my bed right next to me. And then I realized that I hadn't really stretched my arm out. It was so asleep that I couldn't even see it -- or feel it when the other hand touched it.
It was so surreal to feel like there was an extra hand in my bed. Especially since it was warm!
But I managed to fall back asleep -- and this time I didn't sleep on my arm.