Once dismissed as a “necessary evil,” sleep is now recognized as vital for immunity, memory, metabolism, and mental health. New research reveals that sleeping less than seven hours a night can trigger serious long-term risks. Sleep plays a critical role in immunity, metabolism, learning, memory, and countless other processes essential to survival. Chronic sleep deprivation was linked to poor mental health, a higher risk of strokes, obesity, and hypertension. The tipping point? Sleeping less than seven hours a night. This is not about the occasional late night—it’s about what happens when short sleep becomes the norm. Of course, applying this knowledge is easier said than done. Parents of newborns know the reality of fragmented nights, as do shift workers whose jobs demand sleepless hours. But for those of us without such constraints, researchers say there are practical lessons worth adopting. If sleep were useless, evolution would have phased it out. The fact that it exists—and is universal among mammals—proves just how crucial it is to link a balanced diet and movement to human flourishing. Sleep, by contrast, was long treated as an unavoidable inconvenience—a passive state, little more than a “necessary evil.
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