RnP static electricity

So last night, I noticed little sparks near LOs head in the RnP when he was fidgeting in his sleep.  I know it's static electricity, but I'm not sure what to do about it.  My parents think it might be from the dry air from having the heat on all the time. I was thinking about putting a humidifier on tonight to see if that helps.  We can't use dryer sheets because of his eczema.  Does anyone have any chemical free static electricity solutions?