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Mac users can use Night Shift on MacOS with modern system software versions, while older Macs can achieve a similar effect on Mac OS X by purchasing Flux for Mac, which adjusts the screen color in the same way based on time and user settings. Whether you use Night Shift on your iPhone or iPad yourself when the night time rotates, or if you set it to auto mode to adjust yourself as the day changes, be sure to use and try the feature, it’s really nice. In addition to the potential health effects, it is likely to be more pleasant to read and interact with a warmer screen when the evening rotates and the ambient lighting is lower. There is a considerable amount of science behind the harmful effects of blue light exposure on sleep and health. In general, the stronger the thermal setting, the better the properties for reducing blue light are believed to be, although the display clearly changes its color profile to be quite different from the default setting when in use. To adjust the night shift heat, go to Settings> Display & Brightness> Night Shift. The animated gif below shows how the iPhone screen switches between Night Shift and Normal mode, making the Night Shift version significantly warmer and a shade of orange / sepia brown for white and screen colors. If Night Shift was already in use, turning it off returns the screen to the default color profile. The effect is immediate and you will notice that the color changes immediately to warm up if Night Shift is on. Exit the control center normally for the changes to take effect.IOS 9.3, iOS 10, iOS 11: Tap the little sun / moon icon in the center of the control center to turn Night Shift mode on (or off).IOS 12 and iOS 13: Tap and hold the Brightness slider to access advanced settings, then tap the little sun / moon icon that says Night Shift to turn it off or ON.Next, what you do depends on what version of iOS you have: When the storage is being calculated, you can simply tap on Manage option.Access Control Center on iPhone or iPad, iPhone X, and iPad, which means swipe down from the upper right corner, on older iPhone models, swipe up from the bottom of the device screen to access the Control Center.The fastest way to turn Night Shift on or off is to use the Control Center on any iOS device: Enable or disable night shift on iPhone and iPad from the Control Center