Anything that obliges me to deviate from my usual routine on a work day causes me some degree of stress. Having to work from home (which most people view as a perquisite) because it has snowed, as happened this past Monday, stresses me. I always look forward to arriving at my cubicle and getting "settled in". Plus the concern about what constitutes "billable hours" when at home. If I go to the kitchen for a drink, have I gone off the clock? At the office I never worry about such things.