Usually when someone wakes up, they open their eyes. Not a good thing if you're Scott Summers.
So does he wear something to prevent his optic rays bursting out of his eyeballs when he wakes up?
I would assume his visor or glasses may be uncomfortable to sleep with.
It looks like he keeps his mask on. Since the mask requires him to either touch the mask or use the hand switch, he's probably safe.
Just to cover all bases, there was a time between All-New X-Men #3 and Uncanny X-Men v.3 #22 when Cyclops had lost control of his powers such that the visor would not contain them, only his eyelids. I don't know how he slept at that time.
