You will see this. They will sleep, sometimes for days. My son’s father, some days he is as high as a kite, up and doing things, then others, he does not come out of his room. If you knock, he is asleep. This is something that has gone on for years, I never can predict which person is going to show up, so I just go with it.
Please, whatever you do, do NOT let this affect you. If you are not careful, it is easy to get stuck into their routine, doing things when they are up and doing things, and becoming a couch potato when they aren’t.
Remember where the focus needs to be and keep it there.
"Acceptance doesn't mean resignation. It means understanding that something is what it is and there's got to be a way through it."--Michael J. Fox