How to Turn On the Night Light Blue Light Filter in Windows 11

Staring at a bright, blue-tinted computer screen late at night can severely disrupt your circadian rhythm, making it much harder to fall asleep. Windows 11 includes a built-in feature called “Night light” that solves this problem by intentionally shifting your display’s colors toward the warmer, orange/red end of the spectrum. This filters out the harsh blue light, reducing eye strain in dark rooms and helping your brain wind down for sleep.

How to Turn On Night Light Immediately

If your eyes are already hurting, you can activate the filter instantly.

1. Click the Start button and open the Settings app (the gear icon).
2. In the left-hand sidebar, ensure System is selected.
3. In the main window, click on Display (it should be the very first option).
4. Under the “Brightness & color” section, you will see a toggle switch labeled Night light.
5. Click the toggle to turn it On. Your screen should immediately take on a warmer, slightly yellowish tint.

How to Adjust the Strength of the Filter

Some people find the default orange tint too aggressive for reading, while others want it even stronger. You can customize exactly how warm the screen gets.

1. In the Display settings menu, instead of clicking the toggle switch, click anywhere else on the Night light text bar to open its advanced menu.
2. You will see a slider labeled Strength.
3. Click and drag the slider to the left (closer to 0) for a very subtle, mild warming effect.
4. Drag the slider to the right (closer to 100) for an intense, deep orange filter. Adjust it until your eyes feel comfortable.

How to Schedule Night Light Automatically

The best way to use this feature is to set it and forget it, allowing Windows to automatically apply the filter only when it gets dark outside.

1. In the advanced Night light menu, look for the section labeled Schedule.
2. Click the toggle switch next to Schedule night light to turn it On.
3. Two new options will appear below the toggle:
4. Option A: Sunset to sunrise. This is the recommended setting. Windows will use your location data to determine exactly when the sun goes down in your city and automatically turn the filter on, then slowly turn it off when the sun rises the next morning. (Note: You must have Windows Location Services enabled for this option to work).
5. Option B: Set hours. If you work the night shift or have a specific sleep schedule, select this option. You can manually enter the exact time the filter should Turn on (e.g., 9:00 PM) and when it should Turn off (e.g., 7:00 AM).