Simvastatin simvastatin causes nightmares that's why your sweating so bad. I have never had nightmares since I was a kid. I started taking simvastatin (zocor) and the first night I sweated and woke up with a racing heart. I didn't know why. The 2nd night I woke up and thought someone was in my room I saw someone in the dark run across the room. I jumped up jammed my hand into my draw pulling my hand gun out. Now that Im fully awake I don't see anything. I'm so wound up I can't sleep the rest of the night. The next day today I do a google search about nightmares and boom found a new study that Statin's cause nightmares because it penitrates into the brain. Its made out of a fungus. Anyway i'm done with statin's My ratio is 3.63 so not too bad but I think diet and exercise with fish oil will do it. If you have to be on this stuff there are 2 that don't get into the brain. Check it out Pravachol and Crestor.