Dogs, old ones especially. People of course. Planets, atoms, do not.
Pens sleep most of the time.
A fire sleeps by dark, a cat by daylight, each curled in a warming circle. A rock lies still or tumbles, but cannot sleep. A woman touched by a man pretends, sometimes, to sleep, for the pleasure of letting him think that she awakens. After, her thighs sleep differently than before. I have tried to talk with my sleep, to ask it politely for this or that, but it only averts its gaze.