What’s The Right Amount of Sleep?
By Robert Preidt
Seems that you can get too much -- as well as too little -- of a good thing when it comes to sleep.
In what's billed as the world's largest sleep study, too little or too much sleep can impair your brain, researchers report.
The study included more than 40,000 people worldwide who completed an online survey and a series of tests of mental abilities such as reasoning, memory and verbal skills.
Those who slept an average of seven to eight hours a night did better than those who got more or less sleep a night, preliminary results show. About half of the participants said they typically slept less than 6.3 hours a night.