Pen Grip Advice?

Hey guys! Does anyone have any advice or tools that they've used to adjust/loosen their pen grip? I've been holding my pens and pencils inappropriately for years and lately I've been noticing how hard I actually grip my pencils. I've also been getting some stiffness in my right hand, but that's because somehow, I end up sleeping on it. -_- But since my right hand is directly connected to my livelihood, I'd like to maintain it as long as possible! Thanks friends~