Research
Hormonal
Daytime wakefulness is associated with the mobilization of cytotoxic effector cells (NK cells, CTLs) to peripheral blood to provide immediate immunosurveillance against injury or infection.
Acute stress or physical activity during the day naturally mobilizes your 'first responder' immune cells (NK cells) to tissues where they are needed. This is a normal, healthy response to being awake and active.
GoodSupportsHIGH confidence
Cytotoxic effector functions prevail in the wake period... Stress leukocytes reside within the marginal pool... and are mobilised within seconds upon stimulation of their β2-adrenoceptors by epinephrine.
Why this rating
Supported by multiple studies cited in the review regarding stress leukocytes and catecholamine effects.
Source
Sleep and immune function
Luciana Besedovsky et al. · Pflügers Archiv - European Journal of Physiology · 2011
DOI 10.1007/s00424-011-1044-0
narrative_reviewCited 1,106×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Sleep, particularly slow-wave sleep, enhances the formation of immunological memory by facilitating the redistribution of naïve T cells to lymph nodes and promoting pro-inflammatory cytokine production (e.g., IL-12, IL-1, TNF-alpha).Good
- Prolonged sleep loss or wakefulness acts as a stressor that suppresses immune function, increasing susceptibility to infection and inflammation.Good
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