in discussions about the use of smart phones & tablets in relation to disrupting sleep, you see blue light being mentioned a lot. So is the frequency of blue light the reason for draining our cognitive reserves?
In their new operating system for iphone & ipads Apple are introducing a shift from blue to yellow light in the eveing
iPhones will get 'night mode' to improve sleep
Phones, tablets and e-readers currently cause sleep disruptions, and need to shift to 'bed' mode at night, says children's sleep medicine expert
[article=http://www.telegraph.co.uk/technology/mobile-phones/11997012/Smartphones-and-tablets-need-bedtime-mode-to-improve-childrens-sleep.html]More devices like the iPhone, iPad and Kindle emit a blue light that causes our sleep to be restless and disrupted, according to a new study.
Led by Dr Paul Gringras at the Department of Children’s Sleep Medicine, Evelina London, the study found that manufacturers have started making bigger, brighter, bluer screens in an effort to increase the efficiency of our screens during daytime. As an unwanted byproduct, this light is affecting our sleep and productivity.
Kindle, for instance, didn't backlight its screen in older models, but the new version tested - the Kindle Paperwhite first generation - does.
The study, reported first by the BBC, said that this type of light is likely to cause the most disruption to sleep, as it most effectively suppresses melatonin, a hormone that reminds us to sleep every night; the light also increases alertness.
In fact, using our devices before bedtime could even affect our performance during the day, because exposure to this blue light changes our body's natural rhythms.[/article]