Coffee is my go-to energy boost. I love it, I drink it, and it definitely gives me a nice burst of energy. Of course, there is no substitute for getting a good night's rest, and when I feel very run down, I listen to my body and allow myself to nap or just sit down for a while. I've also found that changing my diet has helped. I used to eat processed foods, lots of carbs, and not many veg and fruit. Now I try to eat a healthy varied diet with lots of fruit and veg (different colors), and I feel better all around. Finally, I think there's something to be said about nourishing your emotional energy- if you are drained emotionally, you are much less likely to feel physically energetic.