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My 23 year old Grandson has a similar
Problem to that ,He Has Selective Hearing, by choice.
I spend some time with him on weekends, and he is a Master of that, by simply turning me off. It doesn't help with his head devoted to his Devises 24 hours a day (sort of)
Was he yawning or the other?I have e hubby with selected hearing and he is always yawing