Learn English: Sleeping in Two Parts (easy)

1 day, 9 hours ago

Sleeping in Two Parts

Many years ago, people slept two times every single night.

They would wake up in the middle for a short while.

Bright lights at night made us want to sleep all at once.

It's okay to wake up sometimes, it's a normal thing.

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Source

Original: ScienceAlert

Tags

#sleep history #circadian rhythm #human behavior #sleep patterns #artificial light

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