ambisleeper 

Somebody who can sleep both on their left and their right if they have to

Kate: Lol, I only sleep that side in my bed
Shane: its ok, im an ambisleeper

ambisleeper by ShaneMaster December 19, 2010

ambisleepish 

Possessing the ability to sleep on your left or right side with equal comfort.

My my daughter learned to become ambisleepish when she hurt her hip and couldn't sleep on her preferred side.

ambisleepish by varsityparade September 27, 2020