My 4 and a half year old has been on Singulair on and off. It worked wonders the first year. I stopped it last month. Since he has been on the med I noticed he woke up more at night and cried of leg cramps. This has been going on for a while and everytime I ask the doctor he says that it is growing pains. Also he has bad dreams almost every night. Is is related to Singulair? I think so. How long does it take to go to normal? He still wakes up.
I am not sure how long it will take. We just took my daughter off 2 days ago, but I will say the stomach pains have stopped (at least she hasn't said anything yet). She did sleep through the night last night, no nightmares! Thank goodness. I hope your son will be better soon!