before electricity you simply went to bed when it got dark and woke up when the sun woke up, also didn't sleep a straight 8 more like 5-6 with naps in between. 8 hour sleep/alarm clock are by products of the industrial revolution.
YOUR PARENTS SET YOUR INTERNAL CLOCKS AS KIDS. MY MOM WAKES UP AT 4:30AM EVERYDAY. I DID TOO FOR AWHILE UNTIL I MOVED TO AFTERNOON SHIFT. I DIDN'T NEED A CLOCK UNTIL I MOVED TO AFTERNOONS.
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