Here's what you told us works.
The implications for city-dwelling humans aren't great either.
Newborns sleep about 16 hours a day, but as they age they develop a homeostatic mechanism that balances their increasing ability to stay awake and their ongoing need for sleep. The circadian rhythm of sunlight and darkness helps to drive one part of this mechanism.
Understanding this process could be a first step toward better treatment for insomnia and jet lag.
Your ancestors probably woke up in the middle of the night. So why does it seem like a big deal when it happens today?
There's a peak period to do just about everything, and here's why.