Right, but they’re not going to do their job very well if they’re sleepy. Over time evolution is going to select for the nightwatchers who don’t get sleepy and overlook the shadows in the night, leading to humans who are comfortable being awake at night, and humans who are comfortable being awake during the day. The day humans get food, make clothes, etc for the night humans who make sure the farmers, gatherers, etc are safe when they’re asleep.
I’ve been on night watch. Yes you aren’t as alert when you’re sleepy but that’s just something you have to deal with.
It’s interesting theory that there’s evolutionary nocturnal humans but I’m not sure how concrete that is. In any case, humans being diurnal isn’t contingent on absolutely everyone being like that. It’s just the default with most being like that.
And what about the humans who kept watch at night?
They kept watch so rest of the tribe could sleep.
Right, but they’re not going to do their job very well if they’re sleepy. Over time evolution is going to select for the nightwatchers who don’t get sleepy and overlook the shadows in the night, leading to humans who are comfortable being awake at night, and humans who are comfortable being awake during the day. The day humans get food, make clothes, etc for the night humans who make sure the farmers, gatherers, etc are safe when they’re asleep.
I’ve been on night watch. Yes you aren’t as alert when you’re sleepy but that’s just something you have to deal with.
It’s interesting theory that there’s evolutionary nocturnal humans but I’m not sure how concrete that is. In any case, humans being diurnal isn’t contingent on absolutely everyone being like that. It’s just the default with most being like that.