we sleep when we get tired, yes. but how do we get up rested? i mean our body keeps on working and working. which means we keep consuming energy right? so how do we feel more energetic, more rested as we wake up?
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As I understand, the body has a cleaning system. This system does not extend to the brain. The brain has it’s own cleaning system which only works at night. We’re still not entirely clear on the science as to why we need sleep and what all is going on, but this is the main function not occurring outside sleep which we need to stay healthy. (another important function is memory consolidation)
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