If the moss is truly wet, then you have a light problem or a Nitrogen problem.
I would dry the heck out of the moss and gradually increase light.
One thing that Motes cautions is that overly wet plants during the winter can cause "soft" growth that becomes weak. It is critical for some hardening of the growth. This is for the health of the overall plant.
Also remember that drying encourages new root growth (they seek the moisture and push out from the plant).
