Commentary on selected contributions.
D000204:Activity Cycles / Q000502:physiology*; D000818:Animals; D001831:Body Temperature / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D051379:Mice; D051381:Rats; D012132:Respiratory Muscles / Q000502:physiology*; D012890:Sleep / Q000502:physiology*