Most people need 6 to 8 hours sleep in 24 hours. Based on a study in Sleep Research Centre at the Loughborough University it was suggested that on average, women need slightly more sleep than men.
Lack of sleep can affect: judgement, concentration, blood pressure, blood clotting ability, immune system and the ability to use insulin effectively. Appetite control hormones (ghrelin and leptin responsible for feeling hunger and fullness, respectively) are also affected by sleep restriction.
Sleep pattern changes with age; the ability to fall into deep sleep is reduced with age.
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