The simplest predictor I heard is the lower your resting heart rate, the better you sleep. It is way easier to target that then a jumble of diet, exercise, caff

The simplest predictor I heard is the lower your resting heart rate, the better you sleep. It is way easier to target that then a jumble of diet, exercise, caffeine, light, etc. Try to lower your resting heart rate as you wind your day up, food and blue light raise it, as well as all the obvious things like playing video games or high dopamine things like TV/Social media.