Do I believe, for example, that by using magic I could fly? No. How would you get around gravity? Impossible. Do I believe that I might be able to project my consciousness into a very, very vivid simulation of flying? Yeah. Yes, I've done that. Yes, that works.
Sleep is all about recovering. So if you're not sleeping, you're not recovering. And if you're going to break your body down a lot, you better find ways to build it back up. And the only way to do that is get a lot of sleep. So for me, I go to bed at like 8:30, 9:00. As soon as I put my kids to bed. Because I'm up at 5:30 the next day.