Apps Can Cut Blue Light From Devices, But Do They Help You Sleep?

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?
Read more: https://www.npr.org/sections/health-shots/2017/11/27/561740031/apps-can-cut-blue-light-from-devices-but-do-they-help-you-sleep?source=Snapzu