Since you have a family, it probably has been a while since you goofed off for an extended period. But for me it always gets old. There is only so much time I can spend doing nothing before I get hungry for something of substance.

Note that raising kids is a very substantial activity. I've taken the summer off to hang out with my brother and his family. Even a lot of the nominally fun time with kids means I'm helping educate, build character, and encourage good habits. So maybe the energy you would otherwise put into making a product is going into making a family.