When the eye senses the lack of light, It signals the brain to start producing a chemical called melatonin. melatonin triggers symptoms such as muscle fatigue, the heaviness of the eyelids (the human form of blackout drapes!) yawning etc. you yawn because your body wants to take in oxygen to aid sleep.(this is why "oxygen bars" are so relaxing, although a waste of money). many sleep medications contain a supplement of melatonin to aide sleep.
If the world is permanently lit, we will have trouble producing melatonin, and in turn trouble sleeping. If everyone could be so kind to dim their blaring lights, no one would need sleep medication anymore. this is a real problem that needs real laws against it.
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Re: Our Biology Needs Darkness
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