I really recommend this free software f.lux, if you need to work in front of a computer late at night.
The software reduces the blue light from your screen when the sun sets. The blue light is the light that is responsible for your cortisol production wich is your activation and stress hormone that suppresses your release of the sleep hormone melatonin.
Read more about sleep see if you need more sleep to do peak performance, regenerate and prevent disease in my article Søvndoping (Sleep Doping). Sorry guys I have not translated it yet, so try Google Translate.
Good night and sleep well – Michael Schjerling