Some years back, in one of my previous jobs, I got to the ege of complete physical and emotional breakdown due to working too much and not getting enough sleep for several months.
Of course we can't tell non-Linuxers we use Linux because it's fun - they'd stick us into a mental asylum quicker than you can say "antidisestablishmentarianism".
As an example, spend time with each person getting to know more about them. Keep a mental score card filling it up with their current interests and hobbies.
If our personal life — social, physical, or emotional — is suffering, it will invariably poison the workday, since that's where most of us spend the majority of our time.
What You Can Do: If you're in a busy place, you're bound to both be distracted at one point or another — you can't have your eyes glued to him at all times.