The most common melatonin side effect in children is morning drowsiness. Other common side effects in children include:
Bedwetting
Headache
Dizziness
Nausea
Diarrhea
Possible increased risk for seizures in children with severe neurological disorders.
Dietary melatonin supplements can still have drug interactions or health risks if you have certain medical conditions, upcoming surgery, or other health concerns.
 Melatonin side effects (more detail)
