Читать книгу The Art of Sleeping - Rob Hobson, Rob Hobson - Страница 25

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