Why does the body naturally wake up around the same times every day without any prompting, even if it hasn’t been 8 hours?
In: Biology
Routine, or natural light, familiar sound (boiler, cars, neighbours leaving for work, bin lorries) you’ve trained your brain to listen whilst you sleep. It will even wake you up faster if it hears a faint siren.
ELI5 : it gets light or you hear things.
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