@gear I have natural insomnia and utilize that to increase my productivity. I don't drink energy drinks but do drink a lot of green tea which has as much caffeine as a can of soda.
You can also try meditation I lieu of "power naps" when you're feeling burned out or have low energy rather than reach for another energy drink.
I also find that taking "micro breaks" by getting away from your desk to work on errands or hobbies helps avoid crashes and burnout without chemicals.