I've only been taking Singulair for a week and I couldn't get out of this daze I was in. I've been extremely tired, and depressed. Last night I had a really emotional, very hard, very real bad dream that has made me question why I have been feeling so terrible lately. So I looked up the side effects of Singulair and found this website. After, reading all these posts I quickly called my doctor to get me off this pill. I already suffer from depression, and I am being treated for it. I don't need to take another pill to send me back into the depths of depression and anxiety again. Thanks for all your input. I'm very grateful to have found this out about this pill before it was too late.