There was a period in my life, at my first job, where I was so fed up and bored with what I was supposed to be working on that I just avoided it by surfing the net all day, for months. You would think that goofing off all day on the internet and getting paid for it would be fun, but honestly it made things even worse.
Procrastination seems to be like a drug... it can be refreshing (or at least not painful) in small doses, but after a while you just get strung out and depressed. I had this huge weight over my head about what I "should be doing," but absolutely no motivation to actually do it. It took a conscious act of avoiding my web browser to stop that pattern of self-destructive behavior and get some work done again.
So yeah, anyway, just wanted to add my data point. Procrastinating can often make your mental well being worse off, by throwing in guilt on top of whatever was bothering you in the first place.
"Observance of 'Fun Time' will be strictly enforced."