When you are the default parent it can be overwhelming for 2 weeks of no “rest” from the kids. That “rest” is the time you do housework or do your gym sessions etc. that time doesn’t happen without school easily when the kids are younger. That’s without working. Add in a full time job, it gets harder. I work shifts. I try and do mostly nights in the holidays to save on childcare costs. It means that I can be tired and ratty. And I know that can happen.