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Ideas and practices concerning sleep and night-time are constantly changing and widely varied in different cultures and societies. What we do during the day and night is the result of much political struggle. Trade unions, political parties, entrepreneurs, leaders and schools boards, all have an interest in questions of timing for the opening and closing of shops, the starting hours of schools and factories, and the number of hours people have to work and sleep.

Sleeping customs --- Sleep --- Night --- Time --- Day --- Sleeping --- Slumber --- Health --- Psychophysiology --- Rest --- Sleep-wake cycle --- Subconsciousness --- Dreams --- Hypnagogia --- Sleep customs --- Manners and customs --- Hours (Time) --- Geodetic astronomy --- Nautical astronomy --- Horology --- Social aspects --- Asia --- Social life and customs.