Translation of größenwahnsinnig

I agree that this could be very helpful, as I could bring you my experience and maybe learn from you about new study techniques outside my scope. Language learning is a very broad subject.
I even put on my Poncho, a plastic rain coat, in order to protect myself from the aircon-breeze. Somehow I managed to fall asleep and woke up at around six in the morning when we approach Palenque.
To be honest, we did not understand one word of what he was saying, because his English was so terrible. Or maybe it wasn't and it was only his accent which we could not grasp. To us it was Chinese.