Phones Need 'Bed Mode' to Protect Sleep
Prof Gringras was part of a study, published in Frontiers in Public Health, analysing the light emitted by devices. It concluded there was a clear trend for new devices to be bigger, brighter, have higher levels of contrast and emit more blue light.
The Professor of children’s sleep medicine told the BBC News website: “That is great for use in the day, but awful for use at night. There is converging data to say if you are in front of one of these devices at night-time it could prevent you from falling asleep by an extra hour.”
He said that some sleep-aware apps had already been designed to reduce blue-green light emissions. It is also possible that a bedtime mode could automatically filter out the blue as software such as f.lux already does.
Prof Gringras added: “It’s not good enough to say do less and accept this is the world we live in, they’re fun devices, but we do need some protection on what they do at night-time.”