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Sleep
"Sleep is a basic human need; it is a universal biological process common to all people. Humans spend about one-third of their lives asleep. We require sleep for many reasons: to cope with daily stresses, to prevent fatigue, to conserve energy, to restore the mind and body and to enjoy life more fully. Sleep enhances daytime functioning. Sleep is a basic human need; it is a universal biological process common to all people. Humans spend about one-third of their lives asleep. We require sleep for many reasons: to cope with daily stresses, to prevent fatigue, to conserve energy, to restore the mind and body and to enjoy life more fully. Sleep enhances daytime functioning."--p. 1221.