Story time

A point of variety is when people listen to audiobooks.
Top responses are

• At the gym
• Whilst doing housework
• Whilst driving

In my case its all the above plus...
I simply answer to the general case that people are making...
Any time when the brain is partially, but far from fully occupied.
Audiobooks take up that extra fraction of brain that was otherwise getting bored. They are more stimulating than radio (at least most radio) but are less demanding than TV (both physically and mentally).
I don't listen when I'm composing words but otherwise audiobook-on is my default.