WHY AND HOW WE NEED TO SLEEP 



49 



the work of any other part of the body, and sleep is the 

 only thing that rests it. 



If you lie down and are not asleep, the brain is 

 not really resting. If you dream, it is working a 



Too TIRED TO STAY AWAKE 



little; but it rests perfectly when you sleep perfectly. 



While the brain stops working the rest of the body is 

 not idle. In fact, one of the important things to remem- 

 ber is that children grow fast while they are asleep. 



You can prove this by noticing how much a baby 

 sleeps and how fast he grows. 



