See attached photos. I moved into this house during summer and never noticed this problem. However now that the weather is starting to get cold, I've noticed water droplets on top of the boxes I was storing in the attic. After looking up at the attic ceiling, I noticed that water seemed to be collecting on the nails. The roof on this place is around 20 years old, but I am wondering if the problem is something else. Is my attic getting too humid? How might I mitigate the problem?