"Night Shift" is a free extension for Google Chrome, an unofficial, non-official, and not affiliated with Google Inc. Night Shift is a simple and easy-to-use application that allows you to make your browser's display content warmer in the evenings and more pleasant in the morning. If you feel that after dark you experience discomfort due to a lack of blue light in the screen, Night Shift will help you change the colors of the content on your browser pages towards the warmer end of the spectrum that helps  reduce eye strain and keep a good night's sleep.