Good morning, @immaggiemae I'm Scott, and I saw this with both my wife and my MIL. I know every patient's journey is different, as is their disease and its progression. Likewise, I know each caregiver's situation is also unique so I only offer these observations based on our experiences.

I'm no medical professional of any kind but our neuro doctor told me with my wife it could have been from a number of factors. He mentioned that as her cognitive abilities declined, outside noise was far more distracting to her so she whispered to counteract that. He also said she might subconsciously be actually trying to save energy by whispering. He also suggested it might be a response to her world "getting smaller" as her disease progressed and she became less and less aware of outside people, influences, and needs.

I'm happy to answer any questions you might have.

Strength, Courage, & Peace