Rhonda Patrick· PhD
Evidence suggests that partial & chronic sleep deprivation has detrimental effects on immune function including shifting the balance of immune cells to a pattern that is less able to clear viral infections.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Evidence suggests that partial & chronic sleep deprivation has detrimental effects on immune function including shifting the balance of immune cells to a pattern that is less able to clear viral infections.
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For example, humans immunized against infection with the influenza A virus during a period of partial sleep deprivation had virus-specific antibody titers, less than half of those of non-sleep deprive individuals at 10 days after immunization.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
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Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.