Is this an actual drip or maybe pipes just making noise? If the pipe were to leak/drip at a slow rate, wouldn't the water run down the pipe rather than fall hitting floor in wall? I have considered cutting a 2'X2' in wall from bedroom to look at pipes and see if there is a leak, but dread doing this as I am unfamiliar on patching the hole up again so you wouldn't be able to see it was ever cut out (guess as good a time as any to learn) as well as wall has a faux finish on it, so attempting to redo that and blend it is also daunting.
Any hints or ideas? Thanks in advance