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Exposure to natural light helps regulate our sleepwake cycle from "summary" of Why We Sleep by Matthew Walker
The natural world is a powerful force that shapes many aspects of our lives, including our sleep patterns. One of the key ways in which natural light influences our sleep is by helping to regulate our internal clock, also known as the circadian rhythm. This internal clock is responsible for determining when we feel alert and when we feel sleepy, and exposure to natural light is one of the most important factors in keeping it in sync. When we are exposed to natural light, particularly in the morning, it sends a signal to our brain that it is time to wake up and be alert. This exposure helps to suppress the production of melatonin, a hormone that promotes sleep, and increases the production of cortisol, a hormone that helps us feel awake and alert. By getting this signal in the morning, our internal clock is set to the correct time, which helps us feel more awake and alert during the d...
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