Partial night sleep deprivation reduces natural killer and cellular immune responses in humans.
Level 3 - non-randomized controlled study
Prospective non-randomized within-subject experimental trial
PubMed 8621064 · doi:10.1096/fasebj.10.5.8621064
What was done
Forty-two medically and psychiatrically healthy male volunteers underwent early-night partial sleep deprivation (kept awake from 10:00 P.M. to 3:00 A.M.) followed by a night of recovery sleep. Researchers evaluated circulating white blood cell counts, natural killer (NK) cell count and cytotoxicity, lymphokine-activated killer (LAK) cell count and activity, and concanavalin A-stimulated interleukin-2 (IL-2) production at baseline, after sleep deprivation, and after recovery sleep.
What was found
The abstract reports directional findings without providing numerical values, variance, or p-values. Partial sleep deprivation reduced NK cell activity, NK activity per NK cell, LAK activity, LAK activity per precursor cell (CD16,56, CD25), and concanavalin A-stimulated IL-2 production (attributable to changes in both adherent and nonadherent cells). Following a night of recovery sleep, NK activity returned to baseline levels, whereas IL-2 production remained suppressed.
Why it matters
These findings show that even modest, acute sleep loss can transiently suppress human innate cellular cytotoxicity and T-cell cytokine production.
Limits
The abstract reports no numerical values, effect sizes, or statistical confidence intervals. The sample consisted solely of healthy adult men, precluding generalization to women, older adults, or clinical populations. Additionally, there was no parallel non-deprived control group to rule out potential circadian or protocol-confinement confounders.
Cited by
- context Restricting healthy individuals to four hours of sleep for a single night leads to a 70% reduction in natural killer cell activity.