2. Hydrate Yourself
Now this might seem silly but water seems to be a key component regarding everything related to the human body. Think of water as a fuel for the human brain. You need it to keep yourself going. When you get dehydrated your brain does not function properly and it get all clogged up. Speaking from personal experience, every time I have drank water, I felt much fresher and could concentrate more on my work. So give it a try.