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

Enough sleep is important to health. The amount of sleep __ 1 ________(need) depends 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 should always be enough to make one bring back his __ 6. __________ (strong) and get ready for a day’s work.
Fresh air is necessary to sound sleep. So it is not __ 7. ___________ reason for some people to think that it is practicable to sleep in the open air. A bath at bedtime, __ 8. _________ hot nor cool but of body temperature, may be helpful_ 9. _________ sleep. Sleep-producing drug should never be taken except when _ 10. ________ (suggest) by a doctor.