Charles Xavier- he was trouble readjusting in his sleep so when he is comfortable you form around him.
Hank McCoy- you lay on top of him when it's cold, during the summer he still tries to cuddle you although it's insufferably hot most of the time.
Logan- he is big spoon you are little spoon. Always he likes sleeping holding you.
Alex Summers- you want your space while sleeping you sleep back to back.
Scott Summers- he's been afraid of his glasses coming off in his sleep since forever. Ever since Hank made him literal goggles to wear in his sleep he's all over snuggling. You put your head on his chest and he holds you by the waist.
Kurtis Wagner- he is a restless sleeper you usually try to hold him still. It doesn't always work, he started putting his tail around your waist to anchor himself to something.
Peter Maximoff- he sleeps with his head on your chest, he thinks you have the best "built in pillows".