Apple just released its biggest software update since iOS 9.0 rolled out last year.
With it, Apple is making the highly anticipated Night Shift feature, which reduces the amount of blue light emitted by your display, available to everyone.
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Similar to f.lux, which makes software for desktop computers, Night Shift changes the color temperature of your display when it's dark outside. The later and darker it gets, the warmer the temperature.
You can find the settings for Night Shift in the main settings app by heading to Settings —> Display & Brightness --> Night Shift. From there, you can control when you want the feature to kick in. You can also manually adjust the display's color temperature with a slider.
Night Shift is set to be enabled between sunset and sunrise by default, but you can create a custom schedule of when you want it to kick in by selecting the "From to" menu in display settings. From there, you can choose the times you want it to start and end.
You can also quickly toggle the feature on and off from the iOS Control Center with the new shortcut icon, which is useful for times when you may want to temporarily adjust the display (if you're editing a photo, for instance.)
If you've never used f.lux or similar software, it's difficult to overstate just how much of a difference changing the lighting temperature will make. It not only reduces eye strain at night, it also makes nighttime browsing less disruptive to those around you. I've been using the feature for months now as part of the beta for iOS 9.3 and, while I don't know if it's helped me sleep any better, it's most definitely made nighttime reading more enjoyable.
Here's what it looks like in action.