Stupid o'clock in the morning defined

Being in the office at 5:15am on a Monday morning is as good a definition as any of what I usually refer to as stupid o'clock in the morning. And why am I here at this godforsaken hour, you might well ask? Because I knew I wasn't going to get to sleep any time soon so I figured I might as well get up and go into work where I can use a better computer. What? You didn't think I was going to do any work, surely?