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.”
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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Get some dark chocolate, too