If you have sleep apnea and lie awake at night, melatonin might sound like an easy fix. It’s sold over the counter, it’s often described as “natural,” and many people use it to try to fall asleep faster.

But when sleep apnea is part of the picture, the answer to whether or not it helps isn’t a simple “yes” or “no.”

Taking melatonin may help some people sleep, but it doesn’t treat sleep apnea. If poor sleep is really coming from undiagnosed or undertreated sleep apnea, melatonin alone is unlikely to solve the problem.

Let’s explore what’s currently known about melatonin use for people with sleep apnea.

What Is Melatonin?

Melatonin is a hormone your body makes naturally. It helps regulate your sleep-wake cycle, also called your circadian rhythm. Your melatonin levels usually rise in the evening when it gets dark and fall in the morning when it gets light.

Melatonin is sold as a supplement, usually in tablets, capsules, gummies, or as a liquid. In the United States, melatonin is sold over the counter, so people can buy it without a prescription.

Can Melatonin Help Insomnia?

Melatonin may help some people fall asleep a little sooner, especially if their sleep schedule is off due to jet lag or problems related to shift work. But for chronic insomnia, the evidence isn’t strong enough for it to be a go-to treatment.

The American Academy of Sleep Medicine says doctors should not recommend melatonin as a treatment for chronic sleep-onset or sleep-maintenance insomnia in adults. The academy recommends cognitive behavioral therapy for insomnia (or CBT-I) instead.

That doesn’t mean melatonin never helps. It means the benefits are limited and inconsistent for ongoing insomnia, and it may not address the real reason you’re not sleeping.

If your problem is stress, poor sleep habits, medication side effects, restless legs syndrome, or sleep apnea, melatonin may help only partly or not at all.

Before using any supplement, you’ll want to consider the possible side effects. Common side effects of melatonin are usually mild and can include:

• Headache
• Dizziness
• Nausea
• Daytime sleepiness

Additional daytime grogginess could be especially troublesome if you already feel tired from sleep apnea.

Several MySleepApneaTeam members mentioned their difficulties with daytime sleepiness. One said, “I fall asleep sitting up all the time. I can have a conversation going on with someone and start nodding off. It’s so embarrassing.”

Is Long-Term Melatonin Use Safe?

This is where the biggest questions remain. Short-term melatonin use appears safe for most people, but there isn’t enough information to clearly understand the long-term safety of melatonin supplements.

There are also quality concerns. In the United States, because melatonin is sold as a dietary supplement (not as a prescription drug), it’s regulated less strictly than medications.

The American Academy of Sleep Medicine has pointed out that melatonin content in supplements can vary widely from what the label says. Some tested supplements were found to contain serotonin, which can have harmful effects.

You may also see headlines about newer safety concerns. A large 2025 study found that adults with insomnia who reported long-term melatonin use were more likely to develop heart failure, be hospitalized for heart failure, or die during the study period.

However, the study only showed an association — it can’t prove that melatonin use caused these outcomes. Other factors, including underlying health conditions, could play a role. More research is needed.

Is Melatonin Safe if You Have Sleep Apnea?

If you have sleep apnea, melatonin isn’t a treatment for the condition itself.

Sleep apnea happens when breathing repeatedly stops and starts during sleep. In obstructive sleep apnea, the most common type, the upper airway becomes blocked during sleep.

Melatonin doesn’t keep the airway open while you sleep. It cannot replace proven sleep apnea treatments, such as continuous positive airway pressure (CPAP).

The best answer right now is that melatonin may be reasonable for some people with sleep apnea, but only in a specific context. Research suggests it may help some adults who have both obstructive sleep apnea and insomnia, sometimes called COMISA, especially when they are already using positive airway pressure (PAP) treatment.

More study is still needed, but early research suggests that melatonin could be a part of a sleep apnea treatment plan for some people. Instead of replacing current standard treatments, melatonin may work best as an add-on to proven sleep apnea treatments.

That is very different from saying melatonin is broadly safe or effective for anyone with untreated sleep apnea. Research is still limited, and the more encouraging studies focus on people whose sleep apnea is already being treated.

Here’s a practical way to think about it: If your sleep apnea is diagnosed and treated, and your doctor thinks insomnia is still a separate problem, melatonin may sometimes be considered as part of a bigger plan.

But if you have symptoms like snoring, gasping, waking up choking, or feeling exhausted during the day and you have not been evaluated, it’s smart to rule out sleep apnea first. Untreated sleep apnea can raise the risk of stroke, heart problems, and other serious complications.

Signs Your Poor Sleep Might Be Sleep Apnea

Many people assume they have insomnia when the real problem is sleep apnea or a mix of both. Sleep apnea can be easy to miss because you are asleep when the breathing pauses happen. In many cases, a partner or family member notices it first.

Warning signs of sleep apnea include:

• Snoring loudly and frequently
• Breathing that starts and stops
• Gasping for air during sleep
• Waking up with a dry mouth
• Getting headaches in the morning
• Having daytime sleepiness and trouble focusing
• Feeling worn out even after a full night in bed

Some people also wake up often to urinate at night or think they have insomnia because they keep waking up.

What To Do Instead of Self-Treating

If you have sleep apnea or think you might, start by talking with your healthcare provider about what is disrupting your sleep. You may need a sleep study to confirm sleep apnea.

If you already have a diagnosis, it’s worth asking whether your CPAP device or other treatment is working well enough. Ongoing poor sleep could be related to factors like treatment settings or mask fit.

For chronic insomnia, cognitive behavioral therapy for insomnia is the recommended first-line treatment. It helps you change the habits and thought patterns that keep insomnia going.

If melatonin is considered, your doctor can help you decide whether it fits your situation, how long to use it, and whether it could interact with other medications or health conditions.

Join the Conversation

On MySleepApneaTeam, people share their experiences with sleep apnea, get advice, and find support from others who understand.

Have you ever tried melatonin for poor sleep with sleep apnea? Let others know in the comments below.