I have it often. Sometimes a few nights in a row, and I do actually yell out, but it takes tremendous effort. Feels like it goes on for at least half an hour! When I finally do wake up, my mouth and throat are so terribly dry. I've also gone months in between episodes. Sometimes it's so bad that I am almost afraid to go to sleep at night. Not only that, but I also have bad nightmares. My psychiatrist put me on Xanax XR, and the episodes are greatly reduced, although not stopped altogether.