[brainyz]

There is also a Chrome App called Eye Care. It has slightly more flexibility and runs on Win/Mac/Linux

https://chrome.google.com/webstore/detail/eye-care/ingonfahm...

+1 for f.lux

[giraj]

Another alternative is Melatonin[1] which tries to imitate f.lux for chrome(book) users.

[1] https://giraj.github.io/melatonin