My 10yo is almost 100 lbs. He takes byendril for bed now. As the doctor has said to do this to try and help him get to sleep. Well we have been doing this for 2 mo and it don't work any more. I am thinking about starting Melatonin but unsure if it is safe for my 10yo. and how much to give him.. Bed time is a tough time in our house.. it takes my difficult child 2-3 hours to fall asleep...