If there was a click for each sweep it'll be the wiper relay. I don't hear mine but then at my age my hearing's getting shot :(
Clearly there's nothing wrong with your hearing, lucky devil!
Absolutely normal, it's the variable speed relay operating.
I thought 'Elf and Safety' made you wear ear defenders these days? :unsure:
My hearing loss is just age-related, nothing to do with noise damage. Believe me it's bl***y frustrating so take good care of your hearing.