What would movement around me on the bed be in the dark at night?

Do you have pets? Little kids? Rats?

I would guess mice. Sprinkle a little bird food and see if it’s there in the morning. If the food is disturbed set out some Victor mouse traps.

In my house it would be the cat. However, I’d know it was him because he talks a lot and insists on getting under the quilt. In your house, if you have no cat, rodents. You could use traps or get a cat. That won’t solve the problem but it will change it.

This question might be too obvious, but have you tried turning on your bedside lamp as soon as you feel the “little feet” movement?

One night I felt something very small crawling around on top of the bed near my legs, almost indiscernible, it was a little mouse.

My guess is mice, too.