When I was experimenting with polyphasic sleep there was a moment of around 30 seconds while waking up where I was conscious and aware but not knowing who I was or where I was until I figured out I was lying in the gras instead of standing somewhere. Them I wondered how I'd gotten there and my memories returned.
I used to experience same things after I lose consciousness (happened a lot when I was a teenager). I remember one case, when upon gaining consciousness I was pondering for a whole minute what kind of strange metal columns I see on a horizon. After what felt like a mountain of memories falling onto me, I realized that I'm lying on a floor of a lecture hall, and these columns are just chair legs.
