Finally some good holistic advice on how to actually go about the process of writing:
When you wake up, come back to the computer. Sit and stare at the screen. Do the “sitting up at the computer” posture: Sit straight in your chair and place your hands on the keyboard. Make sure the computer is turned on. Make the “opening a word-processing program” motion with your hands. Then stare at the screen. Make sure your back is straight and your hands are on the keyboard. If you start typing, don’t worry. It’s just your fingers moving over the keyboard. Pay attention to the screen. Did some words appear there? Good. That means you are writing. Don’t worry what the words mean. Just keep making them appear on the screen. If you find yourself slumping over, tense your abdominal muscles to keep yourself sitting up straight. If your legs become uncomfortable, place one ankle under the opposite thigh on the chair. Alternate ankles. Breathe. Let the tension go out of your shoulders. Keep moving your fingers over the keyboard, making words appear on the screen.