I'm a big Walt Disney fan and I love Disney World (and Disneyland) and our family would go for a week or so, usually in February. In the weeks before vacation I would make or lose some money - nothing spectacular. But in the week I returned I would almost invariably make great decisions, my timing would be good and I'd pay for the vacation expenses and then some within a few days of our return.
The worker-productivity researchers and gurus and "wise guys" tell you that vacations tend to make workers more productive and profitable. Somehow in the jobs I've had where I had a boss, he or she just never seemed convinced of that. It was always like they were doing me a favor by giving me some time off.
There's a quote from George Meany, the AFL-CIO president of my youth that goes like this: "One of the bad things about being unemployed is that you never get a vacation." That came from a time when consulting and freelancing were less common but a person who is self-employed is well-advised to carve out vacation time and then take it.
The caveat is that when vacation is over, you have to get back to work. That's me and I'm now officially back to work.