I have an adjustable bed. I found my coughing does increase at night if I’ll lie flat on my back. We purchased the bed for the purpose of helping my cough. I start out with the bed flat and sitting erect with two pillows behind my back. When I begin to nod off, I will slide down onto my side and raise the head portion a small amount (two pillows would have the same result). Side position helps. By morning I can most always lie on my back. A problem with the adjustable bed is ours lifts the entire bed so my husband must endure the position as well. I learned too late one is made for each side to have a choice of positions. Also, when the head section is raised there is a dip in the center of the bed. Actually when both head and foot are raised together a larger dip in the center occurs. So folks with any back discomfort might find it a problem. After having the bed for over a year, I find it has Not helped my nighttime coughing. Side sleeping has.