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Because we feel tired at bed-time it is natural to assume that we sleep because we are tired.The point seems so obvious that..1..anyone has ever sought to question ..2... Nevertheless we must ask "tired..3..what ?"People certainly feel tired at the end of a hard day's manual work,but it is also..4..that office workers feel equally tired when bed-time comes.Even invalids,..5..to beds or wheelchairs,become tired as the evening wears ..6... Moreover,the manual worker..7..still feel tired even..8..an evening spent relaxing in front of the television or..9..a book,activities which..10..to have a refreshing..11.. There is ..12.. proven connection between physical exertion and the..13..for sleep.People want to sleep, ..14..little exercise they have had...15..is the desire for sleep relaxed to mental fatigue.In fact,sleep comes more slowly..16..people who have had an intellectually stimulating day,..17..because their minds are still full of thoughts..18..they retire. Ironically, one way of sending..19..to sleep is to put him or her into a boring situation ..20..the intellectual efforts is minimal.