Enough sleep is important to health.The amount of sleep needed 1.___ on the age of the person and the conditions in 2.___ sleep takes place.The young may need more sleep than 3.___ old,but usually eight hours are enough for the health of grown-ups.Some can do with 4.___ than this amount,but others may need more.Every person knows his own need.5.___ is then a matter of good judgment to satisfy his need.Sleep 6.___ always be enough to make one bring back his 7.___(strong) and get ready for a day's work.
Fresh air is necessary to sound sleep.So it is not 8.___ reason for some people to think that it is practicable to sleep in the open air.A bath at bedtime,9.___ hot nor cool but of body temperature,may be helpful to sleep.Sleepproducing drug(帮助睡眠的药物) should never be taken except when 10.___(suggest) by a doctor.
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