I think out of all sleep is the number one to any successful and healthy life. Without sleep, your brain doesn’t rest. Your brain needs some kind of reward for working so hard. Floating cities is not my thing, since I have no idea how I would react to sea sickness 🤢. I’ve never been in the middle of the ocean actually, even though I live very close to ocean. The same would come to floating cities or islands in the air, I know you didn’t mentioned it, but it just crossed my mind. I don’t like flying much and my wife? Forget it. But that’s just hypothetical this floating cities in the air thing. Anyway, wouldn’t it be interesting?