Hello, It is good to know that cpap has worked out well for you despite the mentioned severity of the problem. To address your concern, i would like to let you know that cpap by itself does not cause increase in the production of saliva in the mouth. Thus, the reason for excessive watering of mouth remains to be decrease in the rate of swallowing by the person. In normal circumstances, the rate of production and rate of swallowing of the saliva balance each other, such that there is no accumulation of saliva in the mouth or drooling out, but just enough moisture in oral cavity. A continuous positive air pressure (cpap) on the nasal and oral-pharyngeal tract exposes the oro-buccal (mouth) muscles to a constant pressure, in turn depriving them of their baseline function of rhythmic contracting.In simple words, the regular contractions in the muscles are interrupted at night, leading to a slight decrease in their basal tone. This manifests as the reduced rate of swallowing, which normally occurs without our awareness in daily routine. Thus, there is nothing to worry about. I would suggest you to consciously swallow the saliva every few minutes and carry a piece of cloth/tissue with you in case you might need to wipe some off. This problem may wean in intensity over a few weeks. In view of the history of stroke, there does not seem to be much concern at present. However, i would like you to look out for any complaints of weakness in the face or body movements, inability to close eyelids, constant drooling of saliva from one angle of mouth, unusual stiffness in the arms/legs, any problem with understanding words or speaking clearly/fluently or for any trouble with holding your bladder/bowel. If such complaints come up, there may be need to consult a physician or a Neurologist for further management. For safety sake, keep a regular check of your blood pressure levels and of course, eat healthy and exercise regularly in moderation. I wish you healthy years ahead. Hope this allays your worry. Happy to help in case any more queries.