I had a period of a few years where I slept very poorly due to allergies. During that time, I was practicing guitar intensively. Despite lots of practice, my pl

I had a period of a few years where I slept very poorly due to allergies. During that time, I was practicing guitar intensively. Despite lots of practice, my playing ability barely improved the whole time; I was not retaining the muscle memory necessary to continue to improve. Now I practice much less and focus on my health. My abilities seem to increase on their own on a slow-but-noticeable basis.