Depends what you focus on as your definition of "living beings". If you look at our cells, they behave more naturally while we sleep. While we sleep, they're "a

Depends what you focus on as your definition of "living beings". If you look at our cells, they behave more naturally while we sleep. While we sleep, they're "awake". So yes, that's their natural state. But the "multicellular organism" mode they switch while we're awake is necessary for them to be more than a pile of cells. Which indeed is very important for our survival, as complex behaviors that only multicellular organisms have, are crucial to our ability to adapt.