I Often Experience A Weird Feeling When Going To Sleep

I often experience a weird feeling when going to sleep especially if I'm tired where my body or parts of as well as things around me such as my bed feel much larger than reality or much smaller or their shape is distorted..I may feel I am just a dot in a huge bed and i can't breath well or my legs are huge and my head tiny!! The feeling goes away if I open my eyes and comes back when I close them