As you may remember, my wife is disabled. She went for a sleep study because she has trouble sleeping at night. She found out that she has sleep Apia. They gave her a C pat machine to use at night when she sleeps. That is a  face mask  hooked to a rubber hose that blows air down her throat while she sleeps . The first night  she wore the mask to bed , I looked over at her , and I thought I was sleeping with a space alien. I am use to it now.