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According to scientists, the circadian rhythm, a 24.1-hour period that dictates the sleep-wake cycle, differs among people and can influence whether we are a "morning lark" or a "night owl". The sleep-wake cycle is generally shorter for early risers than it is for "evening people". Research has proven that though our sleeping and waking preferences may be partially innate, some are due to what we’re used to from childhood, the seasons, or what we have adapted to. This means we can change our sleeping patterns.

02:23, 29 April 2011