This might help you:
If you're not allergic to honey, sometimes it helps to put some on your favorite dessert, cereal, etc.

Drink a lot of water.

Try taking short breaks every once in a while, and when you take those breaks, try listening to music, or taking a short walk (take a noepad to take notes (or use a memo/notepad app) whenever you get an idea for an article-it helps to sometimes get away from your work.

I'm sure there's more advice that I've tried that actually work, but that's what I can think of at the top of my head other than writing rough drafts.