Finally all you fucks will work on my schedule! Night owls unite!
I think the key is just avoiding the heat of the day. A lot of Mediterranean societies already have slow hours during the hottest times (the clearest example being the Spanish Siesta) and it makes a lot of fucking sense.
I doubt we'd move fully nocturnal but normalizing long midday breaks would be excellent - the main impediment is probably our shitty commute oriented society... if it takes you 15 minutes to get home it's quite reasonable to head home at lunch - if it takes you an hour and a half it's impossible.