We've downloaded a little free program called f.lux which adjusts the colo(u)r balance of your computer screen at night to prevent melatonin supression. Certainly makes computing at night more comfortable. Just tell it where you are and what sort of ambient light you have in the house and it adjusts your screen at night. Can be over-ridden if doing sensitive colo(u)r work or watching movies.

Isn't modern technology wonderful? Eventually it comes up with a solution to problems that wouldn't exist without it.