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Circadian Infradian Ultradian
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Biological rhythms lasting around 24 Cycles lasting over 24 hours. Menstrual Biological cycles lasting less
hours-human sleep-wake cycle and core cycle most common example, often 28 than 24 hours- stages of sleep.
body temp cycle. cycle,varies between individuals, 90 minutes, first 4 NREM, 5th
Human sleep-wake cycle facilitated by
regulated by hormone secretions. REM.
time-checks and regular events such as meal