And all the adults share bodies (generally, one body has two people in it). One's asleep (insensate, not forming memories about what's going on, and not in any sort of control over the body) and one's awake (in control, forming memories, experiencing what's going on) at any given time.
So basically the Cherubs in Homestuck.
I barely got ten pages into Homestuck, so I wouldn't know.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.