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Enough sleep is important to health. The amount of sleep nee

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Enough sleep is important to health. The amount of sleep needed __31________ on the age of the person and the conditions in ___32_______ sleep takes place. The young may need more sleep than ___33_______ old, but usually eight hours are enough for the health of grown-ups. Some can do with __34________ than this amount, but others may need more. Every person knows his own need. ___35_______ is then a matter of good judgment to satisfy his need. Sleep __36________ always be enough to make one bring back his __37________ (strong) and get ready for a day’s work.
Fresh air is necessary to sound sleep. So it is not __38_________ reason for some people to think that it is practicable to sleep in the open air. A bath at bedtime, __39________ hot nor cool but of body temperature, may be helpful to sleep. Sleep-producing drug(帮助睡眠的药物) should never be taken except when ___40_________ (suggest) by a doctor.
Enough sleep is important to health. The amount of sleep nee
  31 depends   32 which    33 the      34 less      35 It 
36 should    37 strength   38 without  39 neither   40 suggested