@med08 Lying on your back is one way to do "Postural drainage" using gravity to help get the sputum out. I do not nebulize at the same time but sometimes will use my Aerobika. I will also do manual percussion as I am lying on my back, makes it work even better for me. Here is a great video by Dr McShane on all aspects of Airway Clearance, it should help you understand all the methods and why it is so important to do. https://www.youtube.com/watch?v=L-EHohMe7II Good luck, Bill