THE NERVOUS SYSTEM 



231 



The amount of sleep necessary depends upon our occu- 

 pation and our temperament. Some require little sleep, 

 while others need a great deal. Eight hours of sound sleep 

 for a grown man or woman, and more for children, is about 

 the average amount required. Children naturally need 

 more sleep because 

 their bodies need 

 more rest during the 

 period of growth. 

 Hence the infant 

 sleeps most of the 

 time, if well and prop- 

 erly cared for. 



Little children 

 should always be put 

 to bed early and 

 allowed to sleep in the 

 morning until they 

 awake of themselves. 

 During hot weather 

 the active child should 

 be undressed, bathed, 

 and put to bed in the 

 middle of the day for 

 a good nap. Do not 

 go to bed with the 

 brain excited or too active. Read some pleasant book, talk 

 quietly, sing, take a brisk walk, or otherwise indulge in a little 

 quiet recreation for half an hour before going to bed. 



313. Some of the First Effects of Alcoholic Liquors upon 

 the Nervous System. The first symptom which shows that 

 the nerves are disturbed by drinking alcoholic liquors is the 



FIG. 145. 



Showing some of the superficial nerves on the left 

 side of the neck and the head. A few super- 

 ficial muscles and arteries in the same region 

 are also shown. 



