Before the invention of electricity, light bulbs, and spending a lot of time in front of screens, humans followed a completely different rest routine.
In the pre-industrial world, people did not sleep in one continuous sleep, but in two stages…
Before the invention of electricity, light bulbs, and spending a lot of time in front of screens, humans followed a completely different rest routine.
In the pre-industrial world, people did not sleep in one continuous sleep, but in two stages…

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