4. What Determines The Quality And Quantity Of Sleep We Need?
The amount of sleep that a person needs varies according to the
individual's body and his or her sleeping conditions. Some
people fare nicely on five or six hours of sleep daily, while
others require eight or nine hours daily. Why the difference?
Sleep needs vary with every individual and every circumstance.
People sleep more in winter than in summer! Why should that be
so? Mental workers sleep more than physical workers! What causes
that? People who work and sleep outdoors get by with one to two
hours sleep less than those who work equally arduously indoors
and sleep indoors. Why? To answer the above questions, one must
understand the intricacies of nerve energy expenditure and the
conditions that enable the body to most efficiently regenerate
it. 4.1 Conditions That Promote Efficient Sleep The most
efficient sleep is termed sound sleep, slow-wave sleep; delta
sleep, stage four sleep or deep sleep. Deep sleep produces about
twice the amount of rec