sleep deprivation is associated with worse mental and physical health.The National Sleep Foundation in the United States recommend that teenagers get 8–10 hours of sleep a night and that adults under 65 years of age get 7–9 hours.However, almost one-third of adults who responded to the 2012 National Health Interview Survey reported that they slept less than 6 hours a night. Most research into the cognitive and emotional effects of sleep deprivation involves volunteers spending several nights in the unfamiliar surroundings of a sleep laboratory.Psychologists in Norway wanted to investigate the effects under more natural circumstances, while people were at home and sleeping in their own beds.They discovered that less sleep led the.