..like a teenager. At peace, still, on and on. While the body and mind sleep the transformations happen to both. No one goes around pestering caterpillars once they are all wrapped up in their cocoons, so 'Leave those sleeping teenagers alone!!' is my motto.
When they are awake they have intermittent teenageritis which requires food, drinks and general care. When it is over they head off to do fun things until the next burst of teenageritis hits.
Middle aged people have odd ailments too: extreme grumpiness, odd attacks of nature worship, peculiar longings for order and a love of old TV comedies.