Two sleeps per night

Now we have so much artificial light that after a 1994 earthquake knocked out power, some concerned residents of Los Angeles called the police to report a “giant, silvery cloud” in the sky above them. It was the Milky Way. They had never seen it before.

From an article on how it was once normal to have two sleeps per night:

Before this electrically illuminated age, our ancestors slept in two distinct chunks each night. The so-called first sleep took place not long after the sun went down and lasted until a little after midnight. A person would then wake up for an hour or so before heading back to the so-called second sleep.

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