When people are hyper ventilating and in a panic attack, we'll ask you to breathe in a paper bag. We don't really do that as much any more because the c o two level within the bag starts to sort of increase,. So what happens is we have this thing called physiologica dead space. There's air stuck in there that keeps my lungs open. You can also train your your thoughts through your Breathalyser. The speed of your thoughts correlates with the speed of your exhalation specifically.