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　　Filter Blue Light for Better Sleep

　　Many people like to use their phones or tablets atnight before they go to sleep.

　　However, the light from mobile devices can interferewith sleep. But not all light carries the same risk.

　　Recent studies have shown that within the lightspectrum, blue light can have the worst effect on sleep.

　　Night Shift in Control Center

　　A study in the UK showed that blue light actually can keep sleepy people awake. Tired driverswho were exposed to blue light became as alert as those who drank two cups of coffee.

　　Blue light filters have been developed for mobile devices to help with sleep issues. Apps areavailable for Android devices that filter blue light on screens. Updates to the iPhone, iPad andAmazon Fire tablet have added blue light filters.

　　Twilight App - Android Devices

　　Twilight is a free app that filters blue light on Android device screens. It can be set to turn onby itself. Or users can turn it on and off when they want.In the app settings, you can changethe intensity of the filter, the color and the time the filter turns on and off.

　　Twilight works across all apps, though some apps may not work fully when Twilight's filter ison.

　　There is a YouTube video that explains Twilight use.

　　Twilight is available free for Android devices in the Google Play store.

　　Night Shift - iPhone and iPad

　　Apple updated its operating system for iPhone and iPad earlier this year. Included in the updateis Night Shift, a blue light filter.

　　This feature is available on newer iPhones and iPads, including the iPhone 5s and later, and theiPad Air and later.

　　Night Shift can be set to turn itself on every night or for the user to turn it on and off aswanted.

　　To turn on Night Shift automatically every night, go to Settings, then Display, then Brightnessand then Night Shift.On the Night Shift settings, move the switch to schedule Night Shift. Itcan be set for Night Shift to go on and off at specific times, or at sunset and sunrise.

　　In Settings you can also adjust the color of the filter.

　　Night Shift can also be turned on and off in Control Center on the iPhone and iPad. OpenControl Center by swiping up from the bottom of the screen.

　　The sun and moon icon there identifies Night Shift. Tap it to turn Night Shift on or off at anytime.

　　In an update to Fire tablets at the end of last year, Amazon introduced Blue Shade to filterblue light on screens. Blue Shade is available on more recent Fire tablets.

　　To turn on Blue Shade on a Fire tablet, swipe down from the top of the screen and tap BlueShade. To adjust the color, go to Settings, then Display and, finally, Blue Shade.

　　I'm Dorothy Gundy.