A lot of us use our smartphones at night before bed. This disrupts a natural sleep cycle. One of the reasons it does this is that artificial blue light simulates daylight to our brain. One way to combat this is using an app to change your display. Twilight changes the blue light to red. Your can change the intensity and the app will modify your screen based on the sunrise and sunset and time of day for your location. You can also manually input this. In my usage, it has helped with my sleep. Now medically, the best thing to do is turn the phone off. However, most of us are not going to do that. So this is a good medically valid way of curbing the issue. One interesting thing is how quickly you adapt to the screen. In less than two minutes the screen will appear to be white to you. If you turn the app on pause via notification shade, you will see it become far brighter. I highly recommend this to all Android users. Sadly there is no way to do this on iOS.
Check out Twilight here.
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