Lullabelle
Midlands, England
Sleep paralysis is where you get caught/stuck in the process of waking. Your body is still asleep, but your mind and your perception are a little farther along, so you're sort of aware that you're awake, but you can't move anything.
That alone is unsettling enough, but because your consciousness is still a bit in a sleeping state, you're highly suggestive, and something like the coat tree in the corner can easily become an intruder in your mind, or a noise like the furnace kicking on might sound like an airplane about to crash in your house. Couple that with not being able to move, and it's downright terrifying.
https://en.m.wikipedia.org/wiki/Sleep_paralysis
Sounds familiar, think I may have had that a couple of times