This is something I never think "anyone else is going through" and find out I'm completely wrong. It's all the things I experiment with in my head and keep to myself and here he's taken them all out and tabulated the data.

I would like to add to his findings that alcohol (any amount at all) changes sleep quality for me very consistently (not staying asleep/lack of morning after "rested" feeling). Strange to me that it's not an item on his list but maybe he doesn't drink to begin with.