Nottingham Post published Smartphones and tablets need 'bedtime mode' to help sleep

Mobile devices such as smartphones and tablets should have a bedtime setting to help people sleep, according to a top doctor.Certain blue lights emitted from these devices produce short-wavelengths that increase alertness and disrupt the process of falling asleep, according to Professor Paul Gringas, of Evelina Children's Hospital in London.The sleep medicine and neurodisability professor took part in the research for Frontiers in Public Health that examined the effects of blue light emissions..