I've been learning to fly for the past few weeks (YAY!) but it can really take a lot out of you. I'm flying twice per week, and am going through ground school at the same time. Tuesday and Wednesday - the days I do ground school and my first lesson of the week, respectively - are the days where I stagger around like a zombie, bolting from work on the nose at 5:00 to get to ground school, and not getting home until 10:00. Wednesday I telecommute from home, but it still means I work late to make up for the several hours I'm away from home.
But, its all worth it. I'm only complaining now because its late at night, I'm tired, but not willing to go to sleep yet since I haven't had a chance to work on any of my OSS projects.