Really? Because we had an O2 monitor for him when it came time to be his appointment, his O2 was WNL. It's all in your head. (sorry, used to speaking to other medical professionals - Within Normal Limits) There is no obstruction. I have asthma and sleep apnea. I know what obstructed breathing feels like, this isn't obstruction. It's just you panicking. There have been virtually no deaths as a result of mask suffocation. If you are -actually- having a hard time breathing wearing your mask, you're wearing it wrong.