Scratching noise in walls/ceiling?”
If the noise is restricted to one area and it doesn’t sound “heavy” or is not “scampering” it likely is a hibernating bat. When bats hibernate they will go under the insulation or down into wall voids where they feel safe and protected. This is much different than during the summer when they “roost” along the rafters of the roof. They periodically will “wake up” from their hibernation and move around a bit. This is what you hear and it generally occurs during temperature “spikes.” There is nothing that can do for this, until they become active enough to feed at night. Have a professional inspect in the Spring.