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For babies over 6 months, the amount of nighttime sleep stayed fairly constant across agesâabout 11 hours on average, with a range of approximately 9-13 hours (Iglowstein et al 2003). Baby sleep requirements are also met by sleeping during the day.
On average, about one-third of a person's life is spent sleeping. However, the amount and timing of sleep vary considerably in different people, based on their age and lifestyle. Newborn infants may sleep up to 20 hours a day. Young and middle-aged adults sleep about 8 hours on average. Elderly people tend to get less sleep at night but may take naps during the day.