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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…

Evidence generally suggests that sleeping under six hours is associated with a higher risk of infection: a large five-year study found a 20% higher rate of colds, and a 2023 review reported a broadly consistent link across 40 studies. However, a smaller study of 300 students found no significant association, so the finding is not universal and may depend on population or measurement. More importantly, most evidence is observational and cannot establish that short sleep itself causes illness. Stress is a plausible confounder because it can both…