http://www.medications.com/effect/view/41319 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 Sun, 17 May 2009 22:38:17 -0400 http://www.medications.com/effect/view/41319?item=19908 I have been on Crestor for three days (just took my fourth dose; getting ready for bed) and have had bad nightmares. Will see what happens tonight. http://www.medications.com/effect/view/41319?item=19908 Mon, 18 May 2009 02:20:20 -0400 http://www.medications.com/effect/view/41319?item=19910 Be aware of the drugs which you are not supposed to have along with simvastatin so that you can be away from them and avoid increase intensity of the side effects. http://www.internationaldrugmart.com/zocor.html http://www.medications.com/effect/view/41319?item=19910