It is a bit counterintuitive, but then on the other hand books like Flow and Drive tells exactly about those things. And I've noticed the same on myself, I'm lot happier, when I have things to focus on and I keep on doing things. When I start wander, time slows down and I'm bored quite soon.
It's refreshing to watch, so please check it out.
Matt Killingsworth's TED talk:
Written by +Henri Hämäläinen