How does our body wake up on it’s own from sleep without any external stimuli?
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There’s already a good explanation here, so I’ll tackle from another angle. Because the humans who didn’t wake up and slept all day got hunted and didn’t forage for food etc. So we evolved to wake up due to different factors that are internal. For instance, we think “night owls” evolved so that the other humans would be awake to keep an eye out while they were at their most vulnerable. This came with the benefit of the night owls also being awake while most people slept. Early humans benefitted from having a natural rhythm to their day, including best times to sleep, good times to wake up and hunt/forage, etc. This wouldn’t work if we slept at random.
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