My 87-year-old mother "whistles" under her breath most of the time. There is no tune, really, just a breathy whistling sound. I read somewhere that people with dementia sometimes use this whistling as a soothing mechanism. Has anybody else experienced this?
Does Mom wear false teeth? Do they fit well?
Ask her doctor.
@Sendhelp - It is actually a whistling-type of sound. I ask her what is the name of the tune she is whistling and she is not even aware she is making the noise. She does not have asthma or any other respiratory ailment. She just had a checkup with her GP last week.