Melatonin is generally well tolerated in children in the short term, but "generally" isn't "always." Here are the side effects researchers have seen, what's still unknown, and when to call the pediatrician.
Written by Vita Globe Editorial Team | Reviewed against NIH guidance, systematic reviews and AAP/AASM guidance
What are the side effects of melatonin in kids?
The most commonly reported are morning sleepiness, drowsiness and more nighttime urination[1]. The NIH also lists headache, dizziness, agitation and bedwetting in children[2]. A 2023 systematic review found no link to serious adverse events in children, but more non-serious ones than placebo[3]. Accidental overdoses in young children are a real concern[4].
Caveat: Long-term effects — including any effect on puberty — haven't been well studied, so experts favor short, supervised use[3].
Sources: AAP HealthyChildren · NIH NCCIH · eClinicalMedicine 2023 · CDC MMWR 2022 · Verified 2026-09-27
In this article
What are the common side effects?
Here's what major sources report for children[1][2]:
| Side effect | What it can look like |
|---|---|
| Morning sleepiness / drowsiness | Hard to wake, groggy or cranky at breakfast |
| More nighttime urination or bedwetting | New accidents in a child who was dry at night |
| Headache | Complaints of head pain, often in the morning |
| Dizziness | Unsteady or lightheaded |
| Agitation | Restless, irritable or "wired" instead of sleepy |
Dose matters too. The AAP notes many children respond to a low dose, such as 0.5mg or 1mg, and recommends starting with the lowest dose[1]. Our kids' melatonin dosing guide covers this in more depth.
What does the research say about safety overall?
A 2023 systematic review and GRADE assessment pooled studies on melatonin in children and adolescents[3]. Melatonin wasn't associated with serious adverse events, but non-serious adverse events were more common than with placebo (relative risk about 1.56). The authors rated the evidence as limited and said the gap in safety knowledge "calls for caution against complacent use."
On long-term effects, three studies found little or no influence on puberty after 2–4 years of use, while one flagged a possible delay after more than 7 years[3]. Because melatonin is a hormone, the NIH notes the theoretical concern about hormonal development hasn't been confirmed either way[2].
What about accidental overdose?
This is the risk that's most clearly documented. Poison center reports of pediatric melatonin ingestions rose 530% between 2012 and 2021, to more than 52,000 in 2021[4]. Most were unintentional and involved children 5 and under. More than 4,000 children were hospitalized over the decade, 287 needed intensive care, and two children died.
If you think your child got into melatonin, call Poison Help at 1-800-222-1222, or 911 if they're hard to wake or struggling to breathe. See how to store melatonin gummies safely.
When should you call the pediatrician?
- Any side effect that worries you or doesn't go away
- New bedwetting, frequent headaches or ongoing morning grogginess
- Agitation, mood changes or nightmares after starting melatonin
- Your child needs melatonin for more than a few weeks to fall asleep
The honest summary
- Short-term side effects are usually mild — grogginess, headache, bedwetting, agitation.
- Long-term effects are not well studied.
- Accidental overdose in young children is the clearest risk — store it like medicine.
- Talk to your pediatrician before starting and if anything seems off[5].
Our option
Vita Globe Kids' Melatonin 1mg Gummies – 60ct
Our kids' gummy has a low 1mg of melatonin per one-gummy serving, taken about 30 minutes before bed or as directed. Its label advisory is plain: melatonin can cause drowsiness, use only with adult supervision, consult a pediatrician before use, and keep out of reach of children — it's not candy.
Frequently asked questions
What happens if a child takes too much melatonin?
Some children who swallow too much melatonin need hospital care[4]. Call Poison Help at 1-800-222-1222 right away, or 911 if your child is hard to wake or having trouble breathing.
Can melatonin cause nightmares in kids?
Nightmares aren't among the main side effects the NIH lists for children[2]. If your child starts having them after beginning melatonin, tell your pediatrician.
Can melatonin cause bedwetting?
Yes — increased bedwetting or nighttime urination is a reported side effect in children[2].
Does melatonin affect puberty?
It's unclear. Studies of 2–4 years of use found little or no effect, but evidence is limited and one study raised questions about very long use[3].
Sources
- Esparham A; American Academy of Pediatrics. Melatonin for Kids: What Parents Should Know About This Sleep Aid. HealthyChildren.org. 2026. healthychildren.org
- National Center for Complementary and Integrative Health (NIH). Melatonin: What You Need To Know. Updated May 2024. nccih.nih.gov
- Händel MN, et al. The short-term and long-term adverse effects of melatonin treatment in children and adolescents: a systematic review and GRADE assessment. eClinicalMedicine. 2023;61:102083. doi:10.1016/j.eclinm.2023.102083
- Lelak K, Vohra V, Neuman MI, Toce MS, Sethuraman U. Pediatric Melatonin Ingestions — United States, 2012–2021. MMWR Morb Mortal Wkly Rep. 2022;71(22):725–729. doi:10.15585/mmwr.mm7122a1
- American Academy of Sleep Medicine. Health Advisory: Melatonin Use in Children and Adolescents. Issued September 9, 2022. aasm.org
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
