Still Waters Posted June 23, 2017 #1 Share Posted June 23, 2017 Humans are diurnal animals, meaning that we usually sleep at night and are awake during the day, due at least in part to light or the lack thereof. Light is known to affect sleep indirectly by entraining—modifying the length of—our circadian rhythms and also rapidly and directly due to a phenomenon known as masking. But while a great deal is known about how light affects circadian rhythms, little is known about the direct effects of light on sleep: Why do we tend to wake up if the lights are flipped on in the middle of the night? Why does darkness make us sleepy? https://medicalxpress.com/news/2017-06-neural-relationship.html 1 Link to comment Share on other sites More sharing options...
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