The amount of video games played by American teens is seriously impacting their sleep levels, according to new research. A study by the University of Arkansas for Medical Sciences found that teens who spend a lot of time playing video games are less likely to get the eight to nine hours of kip recommended for their age group. The research – which analysed the data of 16,000 teens – also shows that youngsters who reported getting less than seven hours of rest each night were getting insufficient exercise. Worryingly, only ten per cent of American teens reported getting the recommended level of sleep for their age, leaving them open to negative effects caused by lack of sleep such as low energy levels and moodiness. Caris Fitzgerald, a psychiatry resident at the University of Arkansas for Medical Sciences, said: "When it comes to teens, they have a lot of factors that affect them, from an ever greater quest for independence reflected by later bedtime; to expectations from parents and peers - like texting in the middle of the night”.