I was just wondering what happens when we wake up naturally, so not because of an alarm or being woken up by a loud noise or our partner or something.
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You wake up when your brain detects it being light outside, but in the times when we have had some sleep deprivation, our brains may need longer to get rid of waste products and start organising memories and learned functions over a longer period of time. The cerebellum is washed with a chemical that helps break down plaques and process the removal of dead cells to keep the brain healthy.
It’s also important to note that the brain works hard during sleep and typically if you dream then the brain is re-organising stuff. REM (Rapid eve movement) sleep is the stage where dreams happen and naturally the brain starts and stops these cycles when it has finished doing the organisation. When REM sleep stops, you are more than likely experiencing Deep Sleep which is similar but you are less likely to dream in Deep Sleep. Deep Sleep then progresses to Light Sleep which is where the brain starts to switch functions back on like detecting light, which is when you start to wake.
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