Our biological clocks are automatically reset by outside synchronisers a primarily the sun a through a complex mechanism in which ... In the absence of daylight, it secretes a hormone, melatonin, which is needed for sleep. ... The effect is most pronounced among children and elderly people, but can also be seen in adults.
|Title||:||Parliamentary Assembly Documents, Working papers 2000 Ordinary Session (First part), Volume I|
|Author||:||Europe. Council of, Parliame|
|Publisher||:||Council of Europe -|