More information is needed before anyone can comment. Was it raining? Do you have windows open in the rain? Is the bedroom next to the bathroom (possible water line leaking). Pets in the room, relieving themselves? Is the ceiling wet or are the walls wet? Main floor, second floor, basement? So many possibilities!
Hello. About once every 5 years, I try to make repairs in my house. I installed vinyl plank flooring last year. Vinyl acts as floor insulation retain heat inside the room. On the reverse side, the floor does not let the cold from the screed into the room. Therefore, the house has become much warmer.