Numerous studies have focused on the relationship between sleep and immunity. Conditions such as chronic insomnia or obstructive sleep apnea, which result in sleep deprivation, are reciprocally associated with innate immunity [1,2]. Sleep regulatory substances, which control sleeping patterns, exhibit oscillations in the brain according to sleep/wake cycles. Interleukin-1 beta (IL-1β), tumor necrosis factor alpha (TNF-α), growth hormone-releasing hormone, prolactin, and nitric oxide (NO) are known proinflammatory, somnogenic (sleep regulatory) substances [1,2]. When injected into the central nervous system (CNS), sleep regulatory substances systemically induce either an increase or decrease in sleep. Inhibiting or removing sleep regulatory substances leads to changes in sleep patterns, and such substances are altered in response to pathogens [1,3].Both sleep and innate immunity are influenced by circadian rhythms (Figure 1). In humans, leukocyte trafficking increases with peak circulating immune cell numbers at night. Leukocyte oscillation does not occur without stimuli like the light-