Last year I was diagnosed with sleep apnea and a Bipap machine with an accompanying mask was prescribed. This was very effective in promoting restful sleep initially but I soon began to experience problems from awakening during the night with a very dry mouth and mucous membranes. Even though a humidifier has since been connected to the unit, it hasn't helped much. Has anyone else experienced this problem and found a solution? Would a "sleep pillow" cause the same problem? Thanks in advance for any assistance I may receive.