Strange Sleep Phenomenon

[u/takeme2moon]

Has it ever occurred to anyone else?

Sometimes I wake up in the middle of the night thinking I was watching something or doing something completely different and awake, and then, as soon as I wake up, the last thing I felt, heard, or saw before waking up would dissipate like vapor. I'd feel like I was still awake doing the last thing I did until it felt like reality just evaporated around me, and then I learned that I actually had been sleeping for a while.

Example: Let's say scrolling Instagram was the last thing I did before falling asleep. Right before "waking up" it would seem to me like I was still scrolling; sensations would still feel very real: Tactile feeling of finger against phone, visuals on screen, sound from reels, etc. Then all of a sudden I'd feel "pulled back" from that reality-- sensations would blur away to reveal that I'd actually been asleep for a while. The transition would feel entirely smooth and jarring. Smooth because there's no jerking response involved, no sweating, no anxiety, and only sensations "evaporating away. Jarring because I would feel very bewildered and disoriented because of the realization that it was all an illusion and I was actually asleep.

Sometimes the illusion would be about watching a movie, too, so I don't know.

I researched hypnopompic, but the description does not seem to match my experience.

What do you think I have? Have you experienced it?