@rebecross so sorry about your sleep issues. We've all been there as witnessed by this thread. Asthma might cause some coughing as does incomplete lung clearance. Since I've been clearing 2x day with nebbed albuterol (or puffs of albuterol) followed by 7% saline it's helped with the nighttime coughing. It's work and unrelenting this routine is but I remind myself that I am helping my lungs by clearing them as completely as possible each session since my lungs cannot do this on their own anymore.

Have you tried AD app for clearance? It's my RT coach that I use in multiple positions -- upright, on left then right side followed by flat on my back. This shifting really helps get the gunk out. It's around a 45 minute process, which includes nebbing time with aerobika connected to a nebulizer which is connected to a compressor. It took some time to figure out the routine that works for me, so hang in there until you figure out yours!

Swap the codeine for long acting 12 hour mucinex. Take it before nebbing at night. It helps to thin the gunk so you can cough it out more easily.