Why: it will allow the muscles in your wrist to relax while holding your hand and wrist in an ergonomically appropriate resting position.
Also: Follow all of the steps that you've heard above. If the problem persists, bring your quads to the doctor's office. (I've always wanted to do something like that... lol)
I wanted a Monty Python quote but it was too many chars... 'We are what we repeatedly do. Excellence, therefore, is not an act, but a habit.' -Aristotle. 'Spell it right. Or else.' -El Booj