Star & all,
My memory is, Star, that your dad is not using BiPAP during the day.
So just a note that just not using it during hours that the body needs it is going to accelerate the loss of respiratory function. The muscles have to work harder when they don't have enough to draw on, + don't have support. Would you climb a steep hill in high heels while carrying dumbells?
So the "go do" for anyone who's experiencing a decline and not on BiPAP as often as would be more comfortable, could be to say, "Why not? Is it the mask? Hose length/diameter? The settings? The mode? What needs to be improved?"
And like any machine, of course, BiPAPs need a little maintenance for effectiveness, like changing filters that are dusty/clogged; cleaning/replacing sticky masks; grimy headgear. Even swapping out hoses once a year, even if they look fine.
We now return you to your regularly scheduled programming...