Well hello, I'm new to this line, but have been USING THE MASK FOR YEARS.. CAN ONLY SLEEP ON MY BACK WHEN MACHINE IS ON. OTHERWISE I GET AIR LEAKS. . I HAVE RIGGED UP A STRUCTURE WHICH GUIDES THE TUB OVER THE HEADBOARD AND SO TAKES THE WEIGHT OFF MY FACE.... ALSO I PLACE A HEATER BEHIND THE HEADBOAR...