What would keep Superman from just floating away in his sleep?

If he like dreamed his was floating, would he just float away taking the bedsheets with him?What would keep Superman from just floating away in his sleep?He seems to have to consciously think about his powers to use them. Or it could just be something no one ever thought of, like how he can lift an entire building without it crashing down around him due to the lack of support along the entire bottom. Some people have suggested he has some amount of telepathy without realizing it.What would keep Superman from just floating away in his sleep?
What keeps you from walking in your sleep?



I'm not saying people don't do it, just that it's not normal. Sleep walking is an actual sleep disorder.What would keep Superman from just floating away in his sleep?Uh, I can't say for comics but he's done it before, I think he did it once or twice in Lois and Clark, and he woke up floating above his bed in like the first episode of Smallville.What would keep Superman from just floating away in his sleep?
well your brain secretes a drug called acetylcholine to paralyze us from hurting ourselves when we sleep



i imagine supermans brain secretes a similar drug. maybe like a super acetylcholineWhat would keep Superman from just floating away in his sleep?I'm sure if we can sleep-walk that Superman can sleep-fly. It's happened on Superman shows. He's woken either floating or feeling like he had been floating. But, to do that routinely would be a disorder. And, of course, Superman is DCs perfect being. He has no imperfections other than a weakness of kryptonite. And, that isn't a disorder-it's an allergic reaction.