Switching a phone to a 'red only' mode via an accessibility shortcut eliminates blue light and is a zero-cost method to improve sleep hygiene.

“1. Go to: Settings → Accessibility → Display & Text Size → Color Filters 2. Turn on Color Filters, then choose Color Tint. 3. Choose Red 4. Set Intensity and Hue sliders all the way to the right to make the screen red”

“5. Go back to: Settings → Accessibility → Accessibility Shortcut”

“you can set it so you can triple click on the side and have your phone go basically completely orange like that so it takes out all of the blue light from your phone or almost all of the blue light from your phone”

“So, you go to settings, accessibility, display and text size, color filters. Turn them on. Make sure the intensity is almost all the way to the right. Make sure the hue is almost all the way to the right. Then get out of there. Go back to accessibility. Go to accessibility shortcuts and click on color filters, which means that with a triple click, you can go in and out of the normal screen of your phone, which is going to have blue light.”

“You can set it so you can triple click on the side and have your phone go basically completely orange like that. So, it takes out almost all of the blue light from your phone.”