Disastrous afternoon nap

The moment I "fell asleep", I would have this feeling of 被鬼压. This aint funny yeah? Im mentally awake and but am physically bounded by some unknown force that stopped me from physically awake.

Also, the moment I wake up, drifted back to sleep, I would have weird dreams. Really really weird dreams but some do make some sense. 日有所思，其有所梦吧! Shaldnt dwell into the contents of those as I had already forgot 90% of them.

I really dun understand how this 被鬼压 thing works. It happened to me before and I dunno issit becoz I slept on my "dream nerve" or what. Super weird. Ive never been so awake in my sleep, yet failing to wake up. This feeling really sucked.

Anyone has any answers?