I literally learned to breath properly after reading this book. Took me months to train out of the bad habits I had acquired over the years.

Same here. I now breathe through my nose all night, have trained myself out of a mouthguard and am not bruxating (confirmed by dentist: no more wear from grinding), and I wake up refreshed (even moreso now after quitting caffeine, but that only months compared to years since reading Breath).