Teenagers sleep an average of 40 minutes longer and perform better at school when they are denied smartphones in the evening, according to a study by the University of Geneva. +Get the most important news from Switzerland in your inbox "Parents therefore play a key role. Their involvement directly influences the health and success of their children," lead author of the study, Kevin Mammeri, was quoted as saying in a press release issued by the University of Geneva. + Why some people choose not to have a smartphone For the study, which was published in the journal Discover Public Health, the researchers analysed responses from over 300 schoolchildren aged between 13 and 15. The young people completed a questionnaire about their sleeping habits and their parents' rules regarding screen use. The results show that pupils who are subject to the strictest rules - no mobile phones in the bedroom and no mobile phone use in the evening - sleep significantly longer. On average, they gain 40 ...
