Edit to add: Maybe *completely* dark wasn’t the right wording, but like, why do people generally prefer sleeping in the dark, why does that affect your ability to fall asleep in many cases?
In: 5
Our bodies’ sleep cycles developed in a natural environment before artificial light. While it is certainly possible to sleep in a light environment (especially if you’re tired enough), light pollution interferes with sleep quality and can prevent the brain from cycling through the different phases of sleep that are required to repair body & brain tissue, consolidate memories, and all the other functions that are supposed to happen during sleep.
Long term, sleeping in a lit environment has been linked to elevated risk of depression and anxiety, dementia, and cancer.
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