The idea that our hunter-gatherer ancestors were running around 16 hours a day with no downtime is a fantasy to begin with. They had more leisure time than early farmers and many Americans[1]
[1] https://www.nature.com/articles/s41562-019-0614-6
Just as animals in the wild - especially other apex predators - spend a lot of time sleeping/lounging. A famous example - the lion.
Just as animals in the wild - especially other apex predators - spend a lot of time sleeping/lounging. A famous example - the lion.