Have you considered adding a column for daily stress levels next to sleep notes? Honestly, when I tried the notebook method, tracking small things like evening screen time made a huge difference. @gavin401 has a point about starting simple, but I'd say also note what you did before bed. We caught that late dinners were messing with our sleep after just a week.

Grind size is the real game changer. You can mess with time all day, but a bad grind ruins everything.