Biological rhythms

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Ultradian rhythms Infradian rhythms

Healthy hearts are not metronomes: what heart rate variability actually measures The 90-minute ultradian cycle: a real rhythm or productivity folklore? Cicadas emerge on 13 and 17 year prime cycles to starve their predators Night shifts and what they do to the body over twenty years Michel Siffre's cave: two months underground and a 24.6-hour day Menstrual synchrony came from a 1971 study that never replicated Body temperature and blood pressure peak in late afternoon — rhythms you can measure How shortening daylight triggers migration and hibernation Coral spawning and palolo worms: animals that read the moon Jet lag eastward hurts more than westward because phase advance is harder Chronotherapy: the hour you take a drug changes the dose you need Blind people with no light signal drift a little later every day Night shift work and cancer: why the WHO calls it a probable carcinogen Hibernation is not sleep — the metabolic switch bears rely on Blocking by energy level instead of by task type

Time Management Future Timeline Calendars Time in life Historical eras Time travel Seasons Endings Units of time