Is Melatonin Safe to Take Every Night? What the New Heart Research Actually Shows

Is Taking Melatonin Every Night Safe?

For the wider picture, see our guide on Common Sleep Disorders: Symptoms, Causes & Health Effects.

Melatonin is a hormone naturally produced by the body that helps regulate the sleep-wake cycle. Melatonin supplements are widely used by people who have trouble falling asleep, adjusting to a new schedule, or dealing with certain sleep-timing problems.

Because melatonin is naturally produced by the body and is available without a prescription in some countries, it is sometimes viewed as completely harmless.

But “natural” does not automatically mean risk-free.

Researchers are still learning about the effects of long-term melatonin use, and recent preliminary research has raised questions about its possible relationship with cardiovascular health.

What Did the New Heart Research Show?

A recent preliminary study examined health records from more than 130,000 adults with insomnia.

Researchers found that people whose records showed melatonin use for at least 12 months had higher rates of newly diagnosed heart failure than matched people with insomnia who did not have documented melatonin use.

The melatonin group also had higher rates of hospitalization for heart failure and death from any cause.

These findings have attracted attention, but they need to be interpreted carefully.

An Association Is Not Proof of Cause

The research was observational, meaning researchers examined existing health records rather than assigning participants to take melatonin or a placebo.

This type of study can identify an association, but it cannot establish that melatonin caused the observed cardiovascular outcomes.

People who regularly use melatonin may differ from non-users in other ways. The severity of their insomnia, other medical conditions, medications, lifestyle factors, and overall health could potentially influence the results.

The findings were also preliminary rather than definitive evidence of harm.

Should You Stop Taking Melatonin?

Not necessarily.

The research does not prove that melatonin causes heart failure, and it does not mean that occasional or short-term use is dangerous.

Instead, it is a reminder that long-term nightly use should not automatically be considered risk-free simply because melatonin is widely available.

If you take melatonin every night, particularly for months or years, discuss your use with your doctor. Your individual health history and other medications matter when deciding whether continued use is appropriate.

Why Persistent Insomnia Deserves Attention

If you feel that you need melatonin every night just to sleep, the bigger question may be why you are having persistent sleep problems.

Insomnia can be related to stress, anxiety, medications, medical conditions, irregular sleep schedules, poor sleep habits, or other sleep disorders.

Sleep apnea is another possibility worth considering, especially if you have loud snoring, nighttime gasping, witnessed breathing pauses, or significant daytime sleepiness.

Treating the underlying problem may be more useful than continually increasing or relying on a supplement.

Healthy Sleep Habits Still Matter

A consistent sleep and wake schedule, a comfortable bedroom environment, regular physical activity, and reducing stimulating activities close to bedtime can support better sleep.

If sleep difficulties continue, a healthcare professional can help determine whether you need further evaluation or a different approach.

Talk to Your Doctor Before Long-Term Use

Discuss regular melatonin use with your doctor if you take it nightly, use other medications or supplements, have chronic health conditions, or continue to experience insomnia.

Do not increase the dose simply because the current amount seems less effective. More is not necessarily better, and the appropriate dose and duration depend on the individual situation.

When to See a Doctor

You may also find these guides helpful: Sleep Apnea or Insomnia? Why the Symptoms Overlap and How to Tell Them Apart, Think You Might Have Sleep Apnea? A Step-by-Step Guide to Getting Evaluated, Primary Care Doctor or Sleep Specialist? Who Should Manage Your Sleep Problem.

Final Thoughts

Melatonin can be useful in certain situations, but long-term nightly use deserves thoughtful consideration. Recent preliminary research has raised questions about a possible relationship between prolonged melatonin use and cardiovascular outcomes, but it does not establish that melatonin causes heart failure. If you rely on melatonin regularly, especially because of ongoing insomnia, discuss your sleep difficulties and supplement use with a healthcare professional. The goal is not simply to treat sleeplessness but to understand and address what may be causing it.

This article is for general information and does not replace personal medical advice.