Call for phones to have “bed mode” to guard sleep
A leading doctor has suggested that smartphones and tablets should have a “bedtime mode” so that people’s sleep is not disrupted by them. The mode should work to filter out blue light which is known to disrupt the body clock and prevent sleep, says Prof Paul Gringras from Evelina Children’s Hospital in London. He also stressed that manufacturers should take more responsibility as new models of phones and tablets are becoming increasingly “bluer and brighter”.
Prof Gringras took part in a study which looked at the light that is emitted by devices such as smartphones, and found that newer devices emit a higher amount of blue light and are bigger and brighter. It has also been found that green-blue wavelengths of light disrupt the production of the sleep hormone melatonin when it gets dark which helps people to go to sleep, and although there are apps that already exist to reduce blue light emissions, Prof Gringras said “the key is to automate it”.
Phones and tablets are fine for use in the day, but the doctor emphasised that more needs to be done to protect what the devices do at night time.