Yeah this happened to me loads as a kid, maybe 7 or 8 years old. Tall, sort of greyish, just standing in the corner of the room not doing anything. I'd freeze up completely and then in the morning convince myself it was a dream but it never felt like one.
The weird thing is it wasn't scary in the way you'd expect. More like being watched by something that was just... observing. Clinical almost.
I've spoken to people about this locally and got blank stares but reading through some abduction accounts it comes up so often it can't just be sleep paralysis every single time. That explanation gets thrown at everything.
Anyone else remember whether it happened more than once, or was it a one off? And did it stop at a certain age? Mine seemed to stop around 10 or 11 and I've always wondered if that means something.