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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…

Across the evidence, short sleep is associated with a higher risk of infections, especially colds, but the size and certainty of the effect remain unclear. The largest individual study found that adults sleeping under six hours had about 20% higher cold rates over five years. However, a smaller student study found no significant relationship, so results are not uniform across populations or study designs. A 2023 review of 40 studies concluded that the overall association is consistent, but also noted a major limitation: stress may both reduce s…