I recently read an article about sleep patterns in animals, and it was fascinating to learn that some animals have bi-phasic sleep patterns, meaning they sleep in two phases instead of one long stretch like most humans. It got me wondering why these animals have evolved this way and what advantages it might give them.
In: Biology
I believe that humans are also bi phasic naturally. Until recently, humans would have a four hour sleep at sundown, then get up in the night and go out, visit their friends and so on, before returning for a second sleep. The invention of the light bulb changed those habits.
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