Some humans evolved to wake up when the sun rises. Others evolved to hit peak wakefulness in the middle of the night. Humans evolved with shift sleeping and night watchers, and are most likely naturally biphasic sleepers as well.
Some humans evolved to wake up when the sun rises. Others evolved to hit peak wakefulness in the middle of the night. Humans evolved with shift sleeping and night watchers, and are most likely naturally biphasic sleepers as well.
index@sh.itjust.works 3 weeks ago
Bats evolved to do that