It isn’t that I wanna know how we fall asleep, more how closing our eyes specifically triggers it.
In: Biology
In your brain, there is a chunk of cells called Superchiasmatic nucleus that acts like the solar panel on older calculators. When you covered up the panel, the calculator got dim or totally stopped displaying anything. Same with SCN – it uses the light from your eyes to run your circadian rhythm. Low or no light, it kicks out melatonin to get you sleepy. Among other things. Light? Time to wake up, diurnal dweller.
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