My 86 year-old father has tinnitus. He wakes from a sound sleep once or twice each night, thinking that there is a humming noise and vibration coming from his upstairs neighbor's apartment. As a result, he has become very cross with his neighbor, thinking it's a deliberate disturbance. I'm trying to determine if it's my father's imagination or if this sensation could be caused by his tinnitus? Has anyone else had a similar experience? Thank you for any advice you can provide.