F.lux for Ubuntu 15.x - blocking out blue light to improve sleep and reduce headaches

Getting strained eyes from looking at your screen too long? F.lux adapts your screen display to the time of day by blocking out the blue light. Blocking out blue light supposibly has lots of benefits including improved sleep, reduced adhd symptoms and many more. See this page for more info. Installing f.lux on ubuntu is easy:

sudo add-apt-repository ppa:blackmage/f.lux; sudo apt-get update; sudo apt-get install -y fluxgui

If the gui fails for you, you can get it to work via terminal: xflux You might also want to give Redshift a try.