Читать книгу The Art of Sleeping: the secret to sleeping better at night for a happier, calmer more successful day онлайн

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26 THE CIRCADIAN RHYTHM Ever wondered why you feel sleepy at around the same time every night or wake up at the same time every day? It’s simply part of your circadian rhythm at work. Circadian rhythms are roughly 24-hour cycles that occur in the physiological processes of living beings – including plants, animals, fungi and cyanobacteria – and exist in every cell in the body, helping to set sleep patterns by governing the flow of hormones and other biological processes. Circadian rhythms are controlled by the body’s internal clock and influenced by environmental factors such as light and temperature; the sleep/wake cycle is an example of a light-related circadian rhythm that determines our pattern of sleep. 26

27 2.00 Deepest sleep 21.00 Melatonin secretion starts 19.00 Highest body temperature 17.00 Greatest cardio- vascular efficiency and muscle strength 14.30 Best co-ordination 15.30 Fastest reaction time 4.00 Lowest body temperature 6.45 Sharpest blood pressure rise 7.30 Melatonin secretion stops 12.00 Midnight 12.00 Noon 18.006.00 10.00 Highest alertness 18.30 Highest blood pressure