ADDers sometimes hyperfocus.

Hyperfocusing provides a reassuring buzz of tightly focused activity that drowns out the distracting din of the world. A lot of ADDers are system admins , programmers, etc… Many ADDers find a computer terminal to be a calm reassuring place to escape to where there are few surprises and a lot less pain than messy attempts at social interraction that often bring hurt and confusion despite the best of intentions on the part of a good-natured ADDer.

For some reason a lot of ADDers are attracted to things technological like computing. Video games provide a bit of an adrenalin rush that some ADDers find soothing. A lack of physical or psychological stimulation might tend to make these things more attractive. Doing things that give a bit of an adrenalin rush ( like weightlifting, jogging, hiking, sex, etc) often provide temporary relief. Also, ADDers continuously avoid boredom. They fill every minute with something to occupy their busy, busy mind. They are in search of that mental buzz, always thinking , always taking in their environment and processing everything around them and mentally projecting the potential outcomes into the future… they naturally have very busy minds. At least, this is how it is for me.