Having grown up in a restaurant, I am accustomed to working up to 80 hours a week and I can tell you from experience that it doesn't feel good on the body - mentally, emotionally, and physically. This is a reminder that, while hard work, practice, and the will to do your best is great, sleeping 7-9 hours a night is critical to success. Take care of your body! You only have one, and life is short!!!
Besides getting a restful night's sleep, meditation, or any other breathing techniques, can be helpful, too! I've started using the app, "Headspace," and it has personally helped me a lot. Just taking even 10 minutes a day to disengage for a bit will go a long way.
Lastly, take more time to plan out your meals and snacks! People assume that eating healthy automatically means paying more. We will opt for fast or junk food because it's "easier" and "faster." We'll make excuses as to why we can't cook at home, brew our coffee in the morning, or fix up a healthy snack - we have work to do! Errands to do! Kids to take care of! Pets to walk!
One tip I can give is creating a shopping list before going to the market (and don't go to the market when you're even the slightest bit hungry!). Write out all the snacks and ingredients for the meals you plan on having - also consider what you might crave as the week goes on. Once all the shopping is completed, take one day (I usually use Sunday), to prepare everything! From cooking quinoa to boiling eggs, chopping fresh vegetables, and blending fruit smoothies! You can separate everything into reusable containers and store them in the fridge.
All that's left to do after that is pour the smoothie into a travel container for breakfast, scooping parts of different items into a container for a tasty salad for lunch, and reheating a meal for dinner! There's less overall clean-up and you save a lot of time in the long run.