i posted this in my intro but i think it'd be more appropriate here.

Sometimes while I'm laying in bed to sleep, I think I'm awake, but at the same time, I start walking in my mind, like a half-dream, then after that first or second step*, I jerk awake, feeling nothing beneath my feet ('cos I'm laying down, horizontal), even though I was only thinking of walking, not actually doing it. I thought I was awake, then I woke up! I think some might see this as my astral projection leaving my body while I sleep or something, but I don't know. Because sometimes I see a sidewalk.

*I feel as though I've been walking a little longer though.