I have this pet peeve of loud morning talkers. I don't know how to explain it but I believe I don't mind loud talkers in everyday life but I notice it right after waking up.
(Usage of the word talkers over speakers chosen to emphasize the human and not the electronic product)
I've recently realised that if I listen to someone talking or say anything myself after waking up to go to the toilet or something, I will not be able to go back to sleep again.
My uneducated guess is that it wakes up the language centre in my brain and for some reason one that is active, sleep is done for the day.