More time for doing non-boring stuff makes you happy. Who'da thunk it?
On a related note, the Norwegian central statistics bureau released today a study on free time and happiness, and in particular how happy various demographics are with the part of their free time when they can do whatever they like. "Me-time".
What stuck out very strongly to me is that they found a very strong correlation with age: couples over 45 were 30 percentage points more happy with their "me-time" than couples under 45, but this was completely independent of whether they had kids or not. Couples without kids vs. with kids were within 1 percentage point of each other in both age groups. I strongly expected to see couples without kids more happy with their "me-time", but apparently they're not.