In his classic text Some Must Watch Whilst Some Must Sleep, the eminent sleep scientist William C. Dement suggested that the "anthropological and sociological implications of sleep are vast and complex" [1]. He was undoubtedly correct. The way we sleep and the meanings, methods, and motives surrounding sleep are historically and culturally dependent. In medieval society, sleeping was a relatively "public" matter, whereas now the nuclear family residence remains one of the few legitimate enclaves for sleep [2]. In pre-industrial society it was common for people to have two separate intervals of sleep each night [3]; today we consider anything which deviates from a monophasic sleep pattern as a potential disorder. In some societies people "rest" in fields standing like storks, and in others husbands sleep with sons and wives sleep with daughters [4].