Interesting read. You need imagination to fuel creativity, the best place for you to think is while in the shower. Due to one of the biggest killers of imagination (anxiety) is gone while in the shower. A lot of factors come into imagination and what fuels it is such as reading or merely just letting your mind wander. Imagination is necessary for sustainability that is the bottom-line
For me, my imagination wanders far and wide (perhaps too far at times) in many situations. I spend a lot of time driving and find that a great place for ideas. Keeping them long enough to take note is difficult though.
Always have a pocketbook with you or a notepad app on your phone ideas can sometimes happen in very random places. Don't try to remember them and write them down later write them down as soon as they happen.
I use wordpress as my notepad but this is the blockchain and I would never take notes while driving.