Duwayne and Darrel Hirsch, 14 year old twins from St. Paul, Minn., for their question:

DOES REST RESTORE ENERGY AS WELL AS SLEEP?  

People who are deprived of sleep lose energy and become quick tempered after two days without sleep, a person finds it is difficult to concentrate and he makes many mistakes.

If a person goes without sleep for more than three days, he will shave great difficulty thinking, seeing and hearing clearly.

All people need sleep. Simply resting doesn't produce the restorative qualities to the body that sleep brings. Sleep restores energy to the body, particularly to the brain and nervous system. Rest alone does not have this power.

Scientists do not know why man cannot simply rest, as insects do. They are also still trying to discover exactly how sleep restores vigor to the body.