title: Sleep: approaching the fundamental questions.
abstract: Our 'sleep need' may be defined as the daily amount of sleep we require to be fully awake during daytime. A recent study has shown that both sleep need and daytime sleepiness decline in older adults.
authors.affiliation: Department of Neurology, University Hospital Zurich, Frauenklinikstrasse 26, 8091 Zürich, Switzerland. christian.baumann@usz.ch
authors.forename: Christian R
authors.initials: CR
authors.lastname: Baumann
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001831:Body Temperature; D002940:Circadian Rhythm; D006801:Humans; D012890:Sleep / Q000502:physiology*