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We have natural sleeping and waking patterns, knows as circadian rhythms, which refer to fluctuations in body temperature, hormone levels, energy levels, and sleep. These occur over a 24-hour period, driven by the brain’s biological ‘clock’. These natural rhythms from day to night allow us to have an abundance of energy throughout the day, but also encourage us to wind down and switch off at night in order to have six to eight hours of restful and restorative sleep.