 [ Symptoms ] is it safe for my 9 year old son to take melatonin 3mg to help sleep most sites say not to give under 18 yrs old my wife is wanting to give my 9 year old son melatonin 3mg to help him sleep all i have read about melatonin is that it should not be given to children under 18 it says it can cause nightmares seizures and other side effects i feel a different method needs to be approached and not use melatonin because of these side effects is it safe for my son to take this [ Disease ] melatonin may not be safe for kids so i would not recommend giving it to him it has been used in some kids in specific studies however children typically already have high melatonin levels there is some concern that giving more melatonin could actually affect development of the reproductive system so it is not recommended in children first you need to figure out why your child is not sleeping if you know why then addressing that specific issue is obviously your best bet if that has not worked i would talk to your doctor before giving him anything to help him sleep