> "You can imagine certain situations where there is a predator or some sort of danger where you need a combination of relatively high function with an ability

> "You can imagine certain situations where there is a predator or some sort of danger where you need a combination of relatively high function with an ability to delay sleep." I think these predator vs. human situations are sometimes exaggerated to prove a point. Not that it can't be, it's just that these articles go straight into it with no pondering on sight. Similar analogies and misconceptions apply to fasting and paleo diets, sparking controversy on how prehistory behavior, human evolution and healthy habits in the 21st century all link up (or don't). Humans have been naturally selecting on so many things - it's just as easy to say the brain responds with dopamine giddiness to protect itself from psychosis after a sleepless night caused by... eating bad food, hunger, insect bites, thirst, etc. No need to bring saber-tooth cats into the equation just for the clickbait.