7.Enough sleep is important to health.The amount of sleep needed(61)depends (depend) on the age of the person and the conditions in(62)whichsleep takes place.The young may need more sleep than the old,but usually eight hours are enough for the health of grown-ups.Some can do with(63)less than this amount,but(64)othersmay need more.Every person knows his own need.(65)It is then a matter of good judgment to satisfy his need.Sleep (66)should always be enough to make one bring back his(67)strength (strong) and get ready for a day's work.
Fresh air is necessary to sound sleep.So it is not without reason for some people to think that it is practicable to sleep in the open air.A bath at bedtime,(68)neither hot nor cool but of body temperature,may be(69)helpful(help) to sleep.Sleep producing drug(幫助睡眠的藥物) should never be taken except when(70)suggested (suggest) by a doctor.