I've purchased this one: https://www.amazon.com/gp/product/B075F7NV56 https://www.amazon.com/gp/product/B075F7NV56 I'm awaiting receipt. I've been putting som

I've purchased this one: https://www.amazon.com/gp/product/B075F7NV56 https://www.amazon.com/gp/product/B075F7NV56 I'm awaiting receipt. I've been putting some thought into how I want to quantify outcomes; sleep, perceived energy levels / fatigue, ability to focus (not sure how to measure this). Nothing else has occurred to me yet. If you had to measure, what would you choose to keep track of?