Eventually, it becomes muscle memory. At least for me, I start memorizing pieces from high-level to bottom, but eventually once I played it from memory too many

Eventually, it becomes muscle memory. At least for me, I start memorizing pieces from high-level to bottom, but eventually once I played it from memory too many times, I struggle to remember or recall high-level concepts and phrases and other things about the piece. But once I sit down and put my hands on the keyboard, it all comes back as I play through muscle memory.