Have you tried getting a grounding blanket for your bed? I am also doing the grounding much more since you mentioned it. I did about 30 minutes this afternoon but I am going to it as much as possible from now on.
I did read about this http://www.shop.earthing.net/
that you put on your bed that will ground you while you sleep. But I'm not sure that my room has a groundable plug. They have a plug test also for about $5. The bed cover is more expensive though. I am thinking about saving up to buy one.
David Wolfe says we should be grounded at least 8 hours a day!