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Evidence on sleep and infection risk is mixed. A large five-year study found adults sleeping under six hours had 20% higher cold rates, but a smaller student study found no significant link between sleep and illness days. A 2023 review of 40 studies reports a consistent association between short sleep and infection risk, yet most underlying studies could not rule out that stress drives both poor sleep and greater susceptibility. Overall, short sleep appears linked to higher infection risk, but the evidence is observational and confounded; poor…

Overall, the evidence suggests short sleep is associated with a higher risk of infections such as colds, but it does not prove that lack of sleep directly causes them. A large 2021 study found adults sleeping under 6 hours had about 20% higher cold rates over 5 years, and a 2023 review found a broadly consistent link across 40 studies. However, a smaller 2019 student study found no significant relationship, showing the effect may vary by population, measurement, or study power. A major caveat is confounding: stress could plausibly reduce sleep…