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How many hours does a 100 year old need to sleep?

According to the National Institute on Aging, older adults generally require 7 to 9 hours of sleep nightly, a recommendation that also applies to centenarians. However, a 100-year-old's sleep differs significantly in quality and pattern from a younger adult's, making the question of 'how many hours does a 100 year old need to sleep?' more complex than a simple number suggests.