Zero has a problem(?) that concerns my boyfriend and I. Sometimes, Zero hyperventilates or something similar where he breathes/wheezes for several seconds and this breathing/wheezing is very loud and rapid. I don't know what causes it, but I've noticed it happens at night. It wakes us up and we are a little freaked out by it, but Zero seems okay after his "attack". Does anyone have an idea what this could possible be?