Non-restorative sleep describes a condition where individuals feel unrefreshed despite achieving objectively adequate sleep duration. Affecting up to one-third of adults, this state acts as a primary driver for serious health complications, including cardiovascular disease, chronic pain, and major depressive disorder. Rather than a simple sleep complaint, it often stems from the disruption of deep, slow-wave sleep, which serves as the brain's essential restorative mechanism. This condition functions effectively as a daytime wakefulness disorder, with cognitive deficits in attention and memory mirroring those of sleep deprivation. Furthermore, social jet lag—a mismatch between internal circadian rhythms and societal schedules—frequently exacerbates these symptoms. Addressing this issue requires shifting clinical focus from mere sleep duration to the functional integrity of both nocturnal restoration and daytime alertness, recognizing that subjective feelings of fatigue serve as precise biological indicators of health.
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