Book Summary
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Our modern lifestyle, in which we spend most of our time indoors looking at bright screens and turn on bright lights at night, activates melanopsin at the wrong times of day and night, which then disrupts our circadian rhythms and reduces the production of the sleep hormone melatonin; as a result, we cannot get restorative sleep. When we wake up the next day and spend most of the day indoors, the dim indoor light cannot fully activate melanopsin, which means that we cannot align our circadian clock to the day-night cycle, making us feel sleepy and less alert. After a few days or weeks, we get into depression and anxiety.
