The researchers also discovered that night owls were 19% more likely to develop type 2 diabetes. Being an early bird is even linked to having a longer life.

A 2019 study indicates that being a night owl — a person who naturally feels most awake and energetic at night — is associated with an increased risk of type 2 diabetes, obesity, and depression.

If you often stay up late and struggle to rise early, you're likely a night owl. But if you wake up refreshed at the crack of dawn, you might be an early bird.

So at that point, early teen years, our rhythms start to drift later., [by] as much as two or three hours. A kid that used to rise and be alert and ready to go at 6 a.m., now it might be more like ...

Why it matters: Peeples says her time in the bunker illustrates the importance of daylight: "Our clocks and this coordination of our entire physiology really counts on those inputs of light and ...

In order to better understand her circadian rhythm, science journalist Lynne Peeples conducted an experiment in which lived for 10 days in a bunker, with no exposure to sunlight or clocks.