My son was on singulair for 6 weeks. Almost immediately he started having huge tantrums. Slaming doors, screaming at me for no reason. He said he had sore ears and couldn't hear. He is 4 and has slept through the night since before he was 1. He is up each night, screaming crying and having nightmares. 2 specialists said this could not be singulair, but I cannot see how it is anything but singulair. Has any body else had this kind of experience?