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The brain does garbage collection when you sleep. Probably it does an even wider reorganization when you leave some neural circuits unused for some time.

Personally, with gaming, I had some improvements coming from restarting a habit but psychologically it is harder to suck more at something and working to get to your former performance. I have seen it in a lot of gamers. They get gud, for some reason they grow tired and leave, they return, they wonder at how out of shape they are, they play a while and leave again when they realize how much they have to work to get to top tier. Ofc I am not referring to games based on the amount of time and money you waste on them, but skill based old school FPS shooters.