4 ms·

I wish it was that easy. The reality is that there are early birds and night owls (see, e.g., http://news.nationalgeographic.com/news/2008/01/080126-sleep-genes

• chii 14y ago
  > It sucks to be a night owl in an early bird world. this is actually quite interesting - you'd think that humans who are less functional during the day time may be at an evolutionary disadvantage during pre-historic times. However, a lot of animals actually tend to be active at night, and so in theory, easier to catch prey at night!
  • SoftwareMaven 14y ago
    From what I understand from the limited reading I've done, it is more like "night guard" versus "morning guard". Somebody needed to be up at night when the ("insert night feeding predator of choice") came to town. My guess is that it wasn't until after we built a world of walls that most people could sleep comfortably at night.
    • ajuc 14y ago
      I've read somewhere that the natural sleep regime for human is to sleep for a few hours after the night come, wake up and be active for 1-2 hours around midnight, and then go back to sleep and only weak up in the morning. There: http://en.wikipedia.org/wiki/Segmented_sleep http://en.wikipedia.org/wiki/Segmented_sleep