I'm a professional model maker, and just a weekend off and I start getting desperate to fiddle with something, I think it's the part of the brain that solves puzzles at work. If I say 'I'll only do ten minutes' it turns into an hour, or a day.
It's a conflict.
Peak performance can only be achieved with regular training, no matter what you do. Recovery is part of it.
But the brain has its own way; I, too, am constantly chewing on unresolved problems. This often leads to progress, but exhaustion is already lurking.
I'm coming off a severe burnout, and I should also know that everything in life is powered by one single battery. You also need sufficient energy for life's vicissitudes, which you can't plan for.
Perhaps it's also a generational issue.
Born in 1966, from an early age, we were only focused on achievement. Building something, achieving something. It was very unhealthy without balance and unbridled thinking. But at least that wasn't an issue in school, where only grades mattered.
Things were freer at university, and then at work, even worse.
After all, many of our generation achieved something, and many ruined themselves.