The two circadian rhythms which are most relevant to the study of sleep are patterns of alertness and

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The two circadian rhythms most relevant to the study of sleep are patterns of alertness and body temperature. Body temperature follows a circadian rhythm, with a peak in the late afternoon/evening and a dip during the night. This dip in body temperature is thought to facilitate sleep onset. On the other hand, patterns of alertness, or the daily cycle of feeling sleepy or alert, is also controlled by our internal circadian clock and is closely linked to sleep/wake cycles. Blood pressure, heart rate, and secretion of hormones can also be affected by circadian rhythms, but are not as directly relevant to sleep.

The Two Circadian Rhythms Which Are Most Relevant to the Study