Singulair and nightmares

my granddaughter has been on singulair since she was 5 months old she is now 6yrs old and it does control her asthma, but lately i have noticed a lot of the symptoms posted here. Headache, stomach pains, nightmares, sleepwalking, and the episodes are getting more frequent. When she does this mostly at night it is scary to me especially when she is crying for help and you don't know how to help her. I was searching for something else and was brought to this site, like i was meant to see it and it really scared me. I have already called her doctor and got an appointment for tomorrow. I want her off this medicine as soon as possible.

When I was using Singulair I had trouble sleeping, then I had trouble waking, even after 10 hours of sleep! I had racing heart rates, headaches often, my blood pressure was high, which it never was before, gained weight, felt like I was often on the verge of tears, mean aggressive and plain old nasty which in unlike me. Would have the craziest dreams or nightmares I ever had. I've been off for several months (10) I've been like the old me for quite awhile now. I had surgery in 2006 and had the usual testing done everything was normal. I am getting ready to have some surgery so my dr. ordered some test, an ekg which came back abnormal, it was explained to me that it was like my heartbeats didn't have a strong beat, maybe a heart attack or something. I never felt or knew anything about this. I am wondering if the singulair did something to my heart. I was on singulair for about 18 months. If it weren't for the ekg I would have never known this problem exsisted. I have no symptoms of any heart problems. I am a 52 year old woman who eats great and exercises daily (since I was in my 20's) . Anybody else have any similar reactions?

My daughter is 5 years old and has been on singulair for 1 week. i have already noticed a dramatic change in her behavior. she has become irritable, mean, nasty, and emotional. she has had me in tears on a daily basis. she has turned into a monster. we will be calling the doctor in the morning!