Aware of brain falling asleep?
This has happened to me only a few times, including last night. I instantly became lucid as I was falling asleep, and I felt my body unable to move and my brain start to shut down. It started to feel unpleasant, similar to the feeling when I once passed out, so I woke myself up. When this has happened, it has always given me an unpleasant feeling in my head, including one time when I got a bad headache temporarily.
Does anyone else have this happen to them, and why would this give me a headache?