Sleep Experts Issue Warning About Popular Bedtime Supplement

Health Points

• Melatonin overdoses reported to poison control centers have surged dramatically in recent years, particularly among children
• Excessive melatonin can disrupt natural sleep cycles and cause daytime drowsiness, headaches, and mood changes
• Experts recommend consulting healthcare providers before using melatonin supplements, especially for vulnerable populations

Millions of Americans turn to melatonin supplements to help them fall asleep each night, but health experts are raising concerns about potential risks from taking too much of the popular over-the-counter sleep aid.

Melatonin is a hormone naturally produced by the body to regulate sleep-wake cycles. While melatonin supplements are widely considered safe for short-term use, medical professionals warn that excessive amounts can trigger unwanted side effects and may even worsen sleep problems.

The number of melatonin-related calls to poison control centers has increased significantly over the past decade. Between 2012 and 2021, reports jumped by more than 530%, with children accounting for a substantial portion of these incidents, according to data from the American Association of Poison Control Centers.

Disrupted Sleep Patterns

Taking too much melatonin can paradoxically interfere with the body’s natural sleep rhythms. When excessive amounts flood the system, the hormone may remain in the bloodstream longer than intended, throwing off the internal clock that regulates when we feel sleepy and alert.

“Your body naturally produces melatonin at night, and when you supplement with large doses, you can actually confuse your circadian rhythm,” explains Dr. Michael Breus, a clinical psychologist and sleep specialist. “This can make it harder to fall asleep naturally over time.”

Sleep experts note that more melatonin doesn’t necessarily mean better sleep. Studies suggest that lower doses, typically between 0.5 and 3 milligrams, are often just as effective as higher amounts.

Daytime Drowsiness and Grogginess

One of the most common complaints from people taking excessive melatonin is feeling unusually tired or foggy-headed the next day. This lingering drowsiness occurs because the supplement hasn’t fully cleared from the body by morning.

The extended drowsiness can affect daily functioning, making it difficult to concentrate at work, drive safely, or engage in activities that require alertness. For older adults already at risk for falls, this daytime grogginess poses additional safety concerns.

“If you’re waking up feeling like you’ve been hit by a truck, that’s a sign you may be taking too much,” Dr. Breus notes.

Headaches and Dizziness

Headaches rank among the most frequently reported side effects of melatonin supplementation, particularly at higher doses. Some users also experience dizziness or mild nausea.

These symptoms typically resolve once the body metabolizes the excess melatonin, but for regular users taking large amounts, the discomfort can become a persistent problem. Medical professionals suggest starting with the lowest effective dose to minimize these adverse reactions.

Mood and Behavior Changes

Less commonly, excessive melatonin intake has been associated with mood disturbances including irritability, anxiety, and depression. Some individuals report vivid dreams or nightmares when taking higher doses.

Children may be particularly susceptible to behavioral changes from melatonin. Parents should work closely with pediatricians to determine appropriate dosing, as children’s bodies process the supplement differently than adults.

The American Academy of Sleep Medicine emphasizes that melatonin should not be considered a first-line treatment for chronic sleep problems. Instead, experts recommend addressing underlying causes of insomnia through behavioral changes such as maintaining consistent sleep schedules, limiting screen time before bed, and creating a relaxing bedtime routine.

“Melatonin has its place, but it’s not a magic bullet,” says Dr. Raj Dasgupta, a pulmonary and sleep medicine specialist. “If you’re relying on it every night, especially in large amounts, it’s time to talk to your doctor about what’s really going on with your sleep.”

For those who do use melatonin supplements, experts advise taking the lowest dose that produces the desired effect, typically 30 to 60 minutes before bedtime. Products should be purchased from reputable manufacturers, as melatonin supplements are not regulated by the FDA with the same scrutiny as prescription medications.

Quality and dosing accuracy can vary significantly between brands. Some studies have found that actual melatonin content in supplements can differ by as much as 400% from what’s listed on the label.

Certain populations should exercise particular caution with melatonin supplementation. Pregnant or nursing women, individuals taking blood thinners or immunosuppressants, and those with autoimmune disorders should consult healthcare providers before using melatonin.

As Americans continue searching for solutions to the nation’s sleep crisis, health experts stress the importance of using melatonin responsibly and being alert to signs of overuse.