Have been using a cpap for almost 5 years and it has worked out very well. Last night I woke up to go to the bathroom and when I sat on the edge of the bed to stand up I got real dizzy. Had to lay back down for five or more minutes and the dizziness went away enough that I could get to the bathroom. I did not put my cpap back on for the rest of the night. Woke up this AM and was OK. Don't know if it is the cpap or something else. I have the nose mask only and once in a great while my mouth will open up. Will this cause problems with my breathing that could produce dizziness.