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Even in deep sleep, your auditory system remains surprisingly active. While your ears still pick up environmental sounds, it’s your brain’s reticular activating system (RAS) that determines which sounds to ignore and which to respond to. This built-in filter ensures that urgent or familiar stimuli—like your baby crying, your name being called, or your morning alarm—still break through.
This survival mechanism is a legacy of evolution, where staying semi-alert to threats was essential. Today, it helps you rest while staying aware of important signals, blending safety with restoration.
,SleepScience ,NeuroscienceFacts ,RestfulSleep ,BrainFunction ,SleepAndHealth
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