Anyone who has learned an alternative keyboard layout will tell you this is true. When you get a new keyboard (say, with linear layout), you will struggle like

Anyone who has learned an alternative keyboard layout will tell you this is true. When you get a new keyboard (say, with linear layout), you will struggle like crazy during the day doing typing tests like https://monkeytype.com/ https://monkeytype.com/ back to back like 20 times, and your speed won't improve –it will deteriorate. But give it a good night's sleep or at least a few hours not doing the exercises, you will come back at higher WPM speeds. And at some point you wake up and it just "clicks" in your brain, congrats you just re-wired your brain.