Fitting in writing

How do people write and work a 'real' job at the same time? Not having the best luck figuring that one out. There's no time! I get ideas in the middle of the day just when there's not a computer in sight. By the time I get home, poof! Gone! Maybe I should start taking a small notebook in to inconspicuously write this stuff down. Doubt that will work. And then there's the exhaustion factor, as in too tired to think straight much less string together coherent thoughts on paper.

Speaking of...It's time for bed.