Your mobile device s screen normally emits a blue light that s fine for daytime use but can disrupt your sleep at night. That s because blue light stimulates your brain and fools it into thinking it s daytime, potentially keeping you awake if you use your device before bedtime.
There are some studies that have found blue light may not deserve its reputation as a sleep-sucking vampire, but limiting your exposure before bedtime is still worth trying, especially if you have difficulty falling asleep.
Your iPhone, iPad, and Windows 10 devices have a feature called Night Shift for changing the color temperature of the screen. Many Android devices also offer a built-in Blue Light feature, and a variety of third-party utility apps get the job done, too. Here’s how to control the blue light on your device.