What just one night of less than 4 hours of sleep does to the body

Even one night of poor sleep changes the way immune cells behave, according to Dr. Sood and supporting research. According to Dr Sood, Killer (NK) cells, who destroy infected or malignant cells, appear to lose a sizable portion of their effectiveness after only four hours of rest, and the data consistently show a dip in NK cell activity

PNSPNS
Nov 4, 2025 - 10:10
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What just one night of less than 4 hours of sleep does to the body
Even one night of poor sleep changes the way immune cells behave, according to Dr. Sood and supporting research. According to Dr Sood, Killer (NK) cells, who destroy infected or malignant cells, appear to lose a sizable portion of their effectiveness after only four hours of rest, and the data consistently show a dip in NK cell activity

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