>>20220688They don't actually sleep, or at least, not in front of the camera with tracking on etc. They get the avatar into a "sleeping" pose and then lock it.
That said, as always, don't blame the chuba, blame the irredeemable pathetic dipshits who actually pay them to do this. Chubas wouldn't do anything if there wasn't a profitable market for it. If you don't like sleep streams, instead of getting mad at the chuba, laugh alongside them and be happy they're siphoning money from retards.