That’s what sleep paralysis is - you’re conscious and you’re still receiving input from your senses, but you’re also technically sleeping - having “dreams” (= allucinations) and your body refusing to move (as is expected from someone fully asleep).

Unlike the OOP, you can’t walk down the hallway then realize you’re dreaming - SP hits you like a truck, with you being relatively aware of your surroundings (plus eventual eldritch horror peeking behind the door).

… a tip that works for me: if/when you want to force your way out of SP, move your fingers or toes; when you think you did it and you feel like you’re out, keep doing it for a few seconds because no you ain’t.
(obviously, your mileage may vary)