Oura ring. Stopped having to guess how much fuel I got for the day. My subjective feeling has a shit correlation with how productive I really am, but the stats from the ring are pretty spot on. I have chronic insomnia so it might help me more than others, but I take quite a lot of decisions based on it. Over 7 hours measured sleep is a good day, 6-7 is standard, 5-6 means modafinil for the day (which turns it into a very productive day), under 5 hours I just chill without any expectations. I also up or lower my meds based on multi-day trends.

It's coping and not a cure, but it's very high quality coping. And I couldn't do it without something to measure sleep - bad nights often have me wake up wired, and 9 hours in bed don't mean much without knowing how much of that I tossed and turned, which I don't always remember.