| http://www.w3.org/ns/prov#value | - The quality of sleep improved throughout the life span, although there was a small increase in sleep difficulties during middle age.These results suggest that the often-reported increase in sleep problems is a non-linear phenomenon, mediated by factors other than physiologic aging, wrote the authors, led by Michael Grandner of the Center for Sleep and Circadian Neurobiology at the University of
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