Demon's can have multiple covers, but they can't have multiple covers active at the same time. When a cover isn't active, it's my understanding that it basically doesn't exist. These bodies have the normal needs to eat and sleep, etc. Demon states that Demons aren't used to these needs. But what happens when you switch covers? Does the active cover have the same needs as the previous one?
Example: if I have covers A and B, and A is hungry and I switch to B, is B hungry? Or does A remain hungry the next time I switch to A (like a low battery I swapped out but still needs to charge)? Or perhaps neither is true, and when you switch back to A it is no longer hungry.
My biggest thought isn't really food but sleep: can a demon get away with not sleeping by switching to another cover?