Hi . My husband's sleep apnea woke him up frequently. It can be pretty scary. His heart rate was often elevated as well when he woke up, probably because he was panicking. If this came on suddenly, it's possible another health condition is causing an obstruction or swelling in your sinuses. If it is sleep apnea, you will likely find that you haven't really been sleeping well for a long time. You just didn't realize it. You will be surprised by how much better you feel after sleeping with a CPAP machine. Regardless, you are smart to make an appointment right away. While you are waiting for an evaluation, you could try sleeping on your side. Many people with sleep apnea get relief that way. I hope this helps and that you get answers and relief. Keep us posted if you don't mind. I will be thinking of you. - Lori (Team Member)