A new scientific review proposes that sleep does far more than restore energy—it helps keep the brain’s complex neural networks stable and adaptable. According to researchers, deep NREM sleep strengthens resilience by resetting overactive neural connections, while REM sleep promotes flexibility by reorganizing brain circuits. Together, these stages prevent the brain from becoming overloaded or locked into unhealthy patterns. Deep sleep also activates the brain’s waste-clearing glymphatic system, helping remove harmful proteins linked to neurodegenerative diseases. Although this is a theory-based review rather than a new experiment, the findings may improve our understanding of conditions such as Alzheimer’s disease, epilepsy, and schizophrenia, while also inspiring smarter artificial intelligence systems.
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