Oh my goodness....thanks to all of you who have taken the time to post strange side affects - particularly those of your children. My daughter (4) has had them too: nightmares, fear, irritability, strange bed-wetting episodes (after more than 2 years of being potty-trained) followed by immediate and deep sleep, nocturnal seizures, anxiousness. Since taking her off the medicine, she is back to sleeping through the night and waking up for a trip to the bathroom. I've been to my pediatrician more than once talking about these episodes. He didn't seem to be aware of any side affects like these for Singulair. He will be now!