Circadian rhythms have been around longer than sleep. BOOM! (Krueger, 2020)
That was perhaps one of the best comments in a recent review article. Because the earth and sun were around long before any animals and it’s unlikely the earliest life forms “slept.”
I don’t know the purpose of sleep, but there are lot of interesting contenders. Matthew Walker’s “Why We Sleep” is loaded with them (for more of the how than why, “Circadian Medicine” is good).
Whatever it’s purpose, it’d better be damn important! Because you’re basically unprotected and vulnerable to easy attack. A lucky animal’s free lunch or get assassinated by a neighboring tribe.
Indeed, the unresponsiveness of sleep must be a big deal.
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These pork rinds are the bomb. Seriously! And if you like spicy…
Get some dark chocolate, too