What works well for me is to 1) work smart not hard, and 2) pace myself. I plan ahead to make everything require less energy, easier and (if possible) more fun.

What works well for me is to 1) work smart not hard, and 2) pace myself. I plan ahead to make everything require less energy, easier and (if possible) more fun. And then I listening to my emotions so I don't push myself too hard, which overwhelms me or drains my energy later. For example I make sure to go running every day. But I only set a minimum like 15mins, and it takes like 5min to get ready. And I can always get a Lyft or slow down if I get tired. This leads to me running for hours which are really like 10 10-min increments, because I can stop whenever I want, but I'm also out there so there's no point in stopping. Also do things that feel easy and natural for you in particular, and don't make things unnecessarily difficult. For example, I don't waste time trying to "study" (stare at papers). I skim them over and re-read / lookup stuff when necessary, because that's how I learn. You'll hear from others about getting good sleep, exercise, diet, etc. I think that planning ahead and listening to your emotions helps with that too. For example, eat when you're hungry, but eat healthy and have something relaxing to do after you eat so you don't over-eat. Also, you don't have to spend 1hour cooking and cleaning, I can microwave frozen veggies and heat up meat in a skillet in 5min, and then clean the 3 dishes I use in 2min. For sleep - sleep when you're tired, but if you need to set a schedule, wake up at a fixed time and your sleep should correct yourself.