" Much sleep is not required by nature, either for our souls 

 or bodies, or for the actions in which they are concerned. For 

 no one who is asleep is good for anything, any more than if 

 he were dead; but he of us who has the most regard for life 

 and reason keeps awake as long as he can, reserving only so 

 much time for sleep as is expedient for health; and much 

 sleep is not required if the habit of not sleeping be once 

 formed." Plato. 



