Montelukast
"Thought this med was my answer! I have severe allergies which I am congested all day and makes it hard to sleep at night . This med cleared me up and  helped me sleep at night But by the 2nd refill I became irritable, emotional  and so moody ! I snapped at people and started having freaky dreams! I took myself off of it even thought it worked for the allergies it wasn't worth it! When I saw my doc and told her she shook her head and said "that's odd I never heard of it doing that "but what I read here validates my experiences! Still can't find Anything that works the way it it did for my allergies!"