Can Melatonin Cause Anxiety? What a Psychiatric Provider Wants You to Know

Melatonin is one of the most popular over-the-counter sleep aids in the country, sold in gummies, tablets, and sprays on nearly every pharmacy shelf. So it can feel confusing - even alarming - when a supplement marketed to help you relax instead leaves you feeling wired, restless, or more anxious than before you took it.

If you've ever asked yourself, "can melatonin cause anxiety?", you're not alone, and you're not imagining it. At Beverly Psychiatric Services, we regularly talk with patients in Chicago and throughout Illinois who came to melatonin looking for better sleep and ended up with a new set of worries instead. Here's what the research actually shows, why it happens to some people and not others, and how our psychiatric team can help if sleep and anxiety are tangled together for you.

Key Takeaways

• Melatonin doesn't directly cause anxiety in most people, but it can trigger anxiety-like symptoms such as restlessness, jitteriness, and vivid or disturbing dreams.

• These effects are usually linked to dose, timing, and individual sensitivity - not a fixed, predictable reaction.

• People with existing anxiety disorders, disrupted sleep patterns, or those taking medications like SSRIs, benzodiazepines, or blood pressure drugs may be more sensitive to melatonin's effects.

• Some research actually points the other direction - low-dose melatonin has shown promise for reducing situational anxiety, such as before surgery.

• If melatonin is making your sleep or anxiety worse, that's a signal to talk with a psychiatric provider rather than simply increasing the dose.

How Melatonin Works in the Body

Melatonin is a hormone produced by the pineal gland, a small structure deep in the brain. Its release is tied to your circadian rhythm - the internal 24-hour clock that governs when you feel alert and when you feel sleepy. As it gets dark, melatonin levels naturally rise, cueing your body that it's time to wind down. As morning light increases, those levels fall again.

Importantly, melatonin doesn't work like a sedative. It doesn't force your nervous system to shut off the way a sleeping pill might. Instead, it signals timing - telling your body when to prepare for sleep. That's a meaningful distinction, because it explains why the same dose of melatonin can feel completely different from one person to the next. Some people fall asleep faster. Others feel more alert, restless, or emotionally unsettled.

So, Can Melatonin Cause Anxiety?

The honest answer is: it depends on the person. Melatonin is not classified as a drug that directly causes anxiety disorders, and most people tolerate it well. But a meaningful number of people report anxiety-related symptoms after taking it, including irritability, jitteriness, a "wired but tired" feeling, and unusually vivid or disturbing dreams.

Rather than melatonin flipping an "anxiety switch," most of what's happening is indirect.

Three mechanisms tend to explain it:

1. Melatonin Can Disrupt Sleep Architecture

Melatonin has been shown to increase the amount of REM sleep, the dream-heavy stage of the sleep cycle. More REM sleep can mean more vivid or intense dreams, which can leave you feeling unsettled or on edge when you wake up. Poor or fragmented sleep quality is closely linked to next-day irritability and anxiety symptoms, so a rough night caused by melatonin can easily look and feel like an anxiety flare-up.

2. Melatonin Interacts With Serotonin

Melatonin doesn't work in isolation. It interacts with other brain chemicals, including serotonin, which plays a central role in mood regulation. In higher doses or with regular long-term use, this interaction may shift mood or anxiety levels for some people, particularly those already taking medications that affect serotonin, such as SSRIs.

3. Dose and Timing Matter More Than People Realize

Most people don't need anywhere near the doses sold in stores. Many over-the-counter products contain far more melatonin than your body would ever produce naturally, and a widely cited supplement-testing study found that the actual melatonin content of commercial products is frequently inconsistent with what's listed on the label. Taking too much, or taking it at the wrong time relative to your natural sleep-wake cycle, can shift your circadian rhythm in the wrong direction and produce the opposite of the intended calming effect.

Common Melatonin Side Effects

According to Mayo Clinic and pharmacist-reviewed sources, most melatonin side effects are mild and temporary. The most frequently reported include:

• Headache

• Daytime drowsiness or grogginess

• Dizziness

• Nausea or upset stomach

• Vivid dreams or nightmares

Less commonly reported effects include short-lived low mood, mild tremor, irritability, confusion, and - relevant to this discussion - mild anxiety. Rare but serious concerns include unusual bruising or bleeding, blurred vision, and allergic reactions, which warrant prompt medical attention.

Who's More Likely to Feel Anxious After Taking Melatonin?

Not everyone reacts the same way. People who tend to notice stronger or more unpredictable effects include:

• Those with an existing anxiety disorder - a nervous system that's already primed to notice physical sensations may interpret melatonin's effects as alarming rather than calming.

• People with fragmented or irregular sleep patterns, where even small shifts in timing are more noticeable.

• Anyone taking interacting medications, including SSRIs and other antidepressants, benzodiazepines, blood pressure medications, anticoagulants, or contraceptives - melatonin can amplify sedation or, in some cases, alter how these medications work.

• People taking higher-than-recommended doses. Most adults only need a low dose (often 0.5–1 mg) to support sleep onset; doses of 5–10 mg or more are associated with a higher rate of side effects.

Wait - Doesn't Melatonin Also Help With Anxiety?

This is where the research gets genuinely interesting, and it's a good example of why "can melatonin cause anxiety" doesn't have a simple yes-or-no answer. Several clinical studies have looked at melatonin as a treatment for situational anxiety:

• Research on patients undergoing surgeries such as hysterectomies and colorectal procedures found melatonin showed promise for easing pre- and post-operative anxiety.

• A randomized controlled trial in cardiac patients found melatonin performed better than a prescription benzodiazepine (oxazepam) for improving sleep quality and reducing anxiety symptoms.

• Another study found melatonin outperformed alprazolam (a benzodiazepine) for reducing anxiety before surgery.

So melatonin isn't inherently "anxiety-causing" or "anxiety-relieving" - its effect depends heavily on the individual, the dose, the timing, and the underlying reason someone isn't sleeping well in the first place. That nuance is exactly why self-treating ongoing sleep or anxiety problems with an unregulated supplement can be hit-or-miss, and why a psychiatric evaluation can save you a lot of trial and error.

What to Do If Melatonin Seems to Be Making You More Anxious

1. Lower the dose before you give up on it entirely. Start as low as 0.5–1 mg, taken 60–90 minutes before bed in a dim environment.

2. Watch your timing. Taking melatonin too early, too late, or inconsistently can work against your natural rhythm instead of supporting it.

3. Give it a short trial, not an indefinite one. If restlessness, jitteriness, or anxious feelings continue after a few nights, that's a sign to stop and reassess rather than push through.

4. Check your other medications. If you take an antidepressant, anti-anxiety medication, blood pressure medication, or blood thinner, talk with a prescriber before combining it with melatonin.

5. Look at the bigger picture. Ongoing insomnia and ongoing anxiety often feed each other. Treating only the sleep symptom with an over-the-counter supplement can leave the underlying anxiety unaddressed.

When It's Time to Talk to a Psychiatric Provider

Melatonin is intended as a short-term aid - not a long-term solution for chronic insomnia or unmanaged anxiety. It may be time to schedule a psychiatric evaluation if you notice:

• Anxiety or restlessness that continues even after adjusting the dose or timing of melatonin

• Insomnia that doesn't improve despite consistent sleep habits

• Anxiety symptoms that are affecting your work, relationships, or daily functioning

• The need to combine melatonin with prescription medications for depression, anxiety, or sleep

• A pattern of relying on sleep supplements night after night without lasting improvement

At Beverly Psychiatric Services, our providers in Chicago offer comprehensive psychiatric evaluations that look at sleep and anxiety together, not as separate problems. Depending on your symptoms, a personalized treatment plan may include evidence-based medication management, therapy referrals, and practical sleep-hygiene strategies - all tailored to your history, lifestyle, and goals, with ongoing follow-up to make sure your plan is actually working. We also offer telepsychiatry for eligible patients throughout Illinois, so support is accessible even if getting into the office is difficult.

Frequently Asked Questions

Can melatonin cause anxiety?

For some people, yes - melatonin can trigger anxiety-like symptoms such as restlessness, irritability, or a wired feeling, usually related to dose, timing, or sensitivity rather than a direct, universal effect.

Why does melatonin make some people feel more anxious?

It's typically indirect. Melatonin can increase REM sleep and vivid dreaming, interact with serotonin, or shift your circadian rhythm if the dose or timing is off - and any of these can leave you feeling unsettled the next day.

What's a safe dose of melatonin to avoid anxiety-related side effects?

Most adults do well starting with a low dose, around 0.5–1 mg, taken 60–90 minutes before bed. Higher doses (5 mg and above) are more strongly linked to side effects, including mood changes.

Should I stop taking melatonin if it's making me anxious?

If you notice restlessness, jitteriness, or worsening anxiety after a few nights, it's reasonable to stop and speak with a healthcare provider rather than continuing or increasing the dose.

Is melatonin safe to combine with anxiety or depression medication?

Not always without guidance. Melatonin can interact with SSRIs, benzodiazepines, blood pressure medications, and other prescriptions. Always check with a psychiatric provider before combining it with other treatments.

When should I see a psychiatrist instead of relying on melatonin?

If sleep problems or anxiety symptoms persist for more than a few weeks, affect your daily life, or don't improve with basic sleep-hygiene changes, a psychiatric evaluation can identify what's really driving the symptoms and offer more reliable, longer-term solutions.

Take the Next Step Toward Better Sleep and Calmer Days

If melatonin hasn't given you the relief you hoped for - or has left you feeling more anxious instead - you don't have to keep guessing. Beverly Psychiatric Services provides compassionate, evidence-based psychiatric care for anxiety and sleep-related concerns for patients throughout Chicago and Illinois, including telepsychiatry options for eligible patients.

Schedule an appointment with Beverly Psychiatric Services to get a personalized plan that treats the whole picture - not just one symptom at a time.

This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider before starting, stopping, or combining any supplement or medication, including melatonin.