Journeys between continents--sleeping around the world.
D002940:Circadian Rhythm; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D012890:Sleep / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000188:drug therapy / Q000209:etiology; D014195:Travel
D006993:Hypnotics and Sedatives