hmm i had something like this today
i woke up and i was watching something on tv and was falling asleep on the bed, then i think i went to sleep and within a few minutes of falling asleep the door bell rung
i was awake eyes opened and all but could not move, i was thinking the damn postman is gonna go away with my parcel lol, i was trying to move and get out of it but nothing was working, it felt like i was trying to rock myself left and right then eventually i came out of it (lasted like 5 seconds tbh - as the postman doesn't usually wait any longer lol)
anyways i tend to notice this happens when i wake up and go to sleep again,
and also mainly when i sleep face up.
sometimes it can be a bit scary, as you can hear all sorts of unusual sounds and get hallucinations, like flashing lights / screaming, or like someones sitting on your chest, its kinda scary but i know myself its not real and its just this sleep paralysis thing tbh, its like your brain is awake but everything else is gone on standby, my eyes are open and i can see around but can not move. On one or 2 occasions everything just fades kinda like your gonna die or something which is ultra spooky
I thought it was something wrong with me but i asked a mate and he said its quite common and told me to google sleep paralysis, hes had it before too.