http://www.medications.com/effect/view/35661 Singulair caused terrible nightmares, vivid, evil dreams and tremors. After a while change of personality and aggression, irritability and anxiety. As soon as it was stopped the nightmares stopped and back to being normal. Very dangerous medication. (Adult) Wed, 15 Oct 2008 16:16:42 -0400 http://www.medications.com/effect/view/35661?item=13480 Please sign out petition for labeling changes to Singulair at www.parentsforsafety.org. Thanks! http://www.medications.com/effect/view/35661?item=13480 Sat, 07 Feb 2009 20:36:27 -0500 http://www.medications.com/effect/view/35661?item=16863 i have been taking singulair for my asthma and last night is the first night I had this horrible demented dream so terrible I didn't want to go back to sleep I am stopping the medicine. I hope this will stop http://www.medications.com/effect/view/35661?item=16863