@karen10225 Hi Karen, back when my MAC was at its worst, I was coughing almost 24/7 and you are correct, it was totally exhausting. I eventually figured out that if I did my last airway clearance of the day just before bedtime, I could get about 4 hours of solid, restful sleep. Then I figured out if I woke up coughing in the night or early AM, it was helpful to get up and do what you might call a "mini" session - get a drink of warm water, do a few rounds of huff coughing and get a bunch of stuff out - then I could fall asleep for a few more hours.
Another thing that helped was sleeping elevated on pillows. What was least helpful was to lay in bed coughing, because it just didn't effectively bring up mucus.

Now, several years past the severe coughing stage, I still have nights or days when my cough threatens to ruin sleep or an activity. I grab the Aerobika and do a mini-session and seem to calm things down.