Keeping my mind sharp

I used to read and do some what engineering chemistry which makes my mind think. The goal is not to become lazy, put in a few hours reading off subjects. That has a problem when trying to sleep where I wake up thinking of what I have read and then fall back thinking.
Once had the bad idea to learn music. Never got beyond a few keys.
Still knowing that time is fleeting away. What I have learn is spelling.
Now if I can only put down on the screen what I think in the correct order.