More and more people are in Sub-optimal health  The reason for this is that poor sleep and too little sleep can cause all kinds of discomfort and even lead to illness  Studies have shown that adults who sleep less than four hours a night, the death rate was 180 percent higher than people who slept seven or eight hours a night
People who slept sometimes less than four hours and sometimes more than eight were 150 percent more likely to die than those who slept seven hours a night.
 But researchers at the University of California, who looked at more than a million people, concluded that those who slept more than eight hours a day had a 120 percent higher death rate than those who slept six to seven hours a night