Apps Can Cut Blue Light From Devices, But Do They Help You Sleep?
Lots of phone and tablet apps promise to improve sleep by filtering out the blue light from device screens. But that won't help if the reason you're not getting enough shuteye is caffeine or stress.
If you're losing sleep over the blue light coming from your phone, there's an app for that.
In fact, there are now lots of apps that promise to improve sleep by filtering out the blue light produced by phones, tablets, computers, and even televisions.
But how well do these apps work?
There haven't been any big studies to answer that question. So I phoned a couple of
