As they say - winter is coming - and that’s mean the day is getting shorter and shorter. Nowadays it’s getting dark quite fast out here so maybe it’s time to adjust the color temperature and the brightness of your screen accordingly to the time of the day/night? There are two alternatives that I know of that can help you with that:
first one is f.lux - I have used it while I was working under windows for most of the time, unfortunately linux distribution is a little behind and it still didn’t get the support for Ubuntu 12.10 and it has some problems with supporting multiple monitors (it may be not true while you read it tho)
the second one (that I’m currently using) is Redshift - and that piece of software you can install directly from ubuntu repositories with no fuss at all Just run
sudo apt-get install gtk-redshiftto install it with simple GTK integration. Here’s configuration that I use:
# ~/.config/redshift.conf [redshift] location-provider=manual adjustment-method=vidmode brightness=0.88 temp-day=6500 temp-night=5000 [manual] lat=here.goes lon=your.location
Other example can be found here, feel free to adjust the settings with trial and error method and give your eyes some rest :).