Chronic pain and poor sleep have a nasty way of feeding each other.
Pain keeps you awake. Then a bad night leaves you more sensitive to pain the next day. Before long, you’re stuck in a cycle that can make both problems harder to manage.
But researchers have found that one familiar bedtime supplement may offer an unexpected two-for-one benefit.
Melatonin — best known for helping regulate sleep — may also reduce chronic musculoskeletal pain.
And according to a new analysis of 23 randomized controlled trials involving more than 2,000 people, its pain-relieving effects fell within a similar range to some commonly used pain medications.
Even better, it improved sleep at the same time.
Melatonin: more than a sleep hormone
Most people know melatonin as the hormone that helps tell your body when it’s time to sleep.
But scientists have been investigating another side of melatonin for years: its potential influence on pain.
Researchers at the University of Sydney analyzed 23 randomized controlled trials involving 2,028 adults from several countries. Participants had conditions including low back pain, osteoarthritis and fibromyalgia, or were recovering from surgery.
The researchers found an important distinction…
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Melatonin reduced chronic musculoskeletal pain, with an average improvement of about nine points on a 100-point pain scale. In the most rigorous studies, reductions were closer to 10 points — within a range similar to effects seen with some opioids, NSAIDs and acetaminophen.
But melatonin did not produce a statistically significant reduction in postoperative pain.
That makes chronic pain the more interesting finding.
“What’s exciting is that melatonin may also help manage chronic pain, opening the door to reducing reliance on medications that come with more risks,” says lead researcher Kangchao Wu.
And there was another benefit: sleep quality improved too.
That’s especially important because pain and sleep are closely connected. Poor sleep can increase pain sensitivity, while pain itself makes restful sleep harder to achieve.
“For many patients, pain doesn’t exist in isolation and is closely tied to poor sleep,” Wu says. “Melatonin appears to target both.”
How much melatonin?
Here’s where I would resist the temptation to offer a one-size-fits-all dose.
Across the chronic musculoskeletal pain trials, doses generally ranged from 3 to 10 mg, with 3 mg the most commonly used dose. Melatonin was usually taken at bedtime or within an hour of sleep.
But researchers found no clear dose-response relationship, meaning the evidence doesn’t support declaring one dose best for everyone.
Melatonin was generally well tolerated in the studies. The most commonly reported side effects were nausea, dizziness and headache, with overall rates similar to placebo. No serious adverse events were reported.
Still, melatonin can interact with medications and may not be appropriate for everyone, so it’s smart to discuss it with your healthcare provider before adding it to your routine.
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Support sleep and pain relief naturally
Supplements aren’t the only way to support healthy melatonin levels.
Your body naturally releases melatonin as evening darkness signals that it’s time to wind down. Bright light — particularly late-night light from lamps, phones, tablets and computers — can interfere with that signal.
A few simple habits may help:
- Get morning sunlight. Early daylight helps reinforce your body’s natural sleep-wake rhythm.
- Support your vitamin D3 levels. Low vitamin D status has been linked to poorer sleep, and vitamin D appears to play a role in regulating circadian rhythms and supports pathways needed to make melatonin. It may also pull double duty for people dealing with pain: vitamin D3 influences inflammatory and pain-signaling pathways that may affect how strongly pain is felt.
- Stay active. Regular physical activity can support better sleep. Even walking counts. Exercise can also reduce sensitivity to pain.
- Dim the lights at night. Reducing bright light and screen exposure before bed can help your brain prepare for sleep.
- Watch late-day caffeine and alcohol. Both can interfere with sleep quality.
- Limit fluids close to bedtime if nighttime bathroom trips regularly wake you.
Melatonin isn’t being proposed as a replacement for pain medication. The researchers themselves describe it as a possible addition to a broader pain-management plan, particularly for people whose chronic pain and sleep problems go hand in hand.
But considering how often those two problems travel together, having one option that may address both could be welcome news.
Sources:
Efficacy and effectiveness of melatonin for the management of musculoskeletal pain: a systematic review and meta-analysis of placebo and active controlled trials — Pain
Common Sleep Supplement May Also Ease Chronic Pain, Review of 23 Trials Reveals — Science Alert
Melatonin: A hormone that modulates pain — Life Sciences
Vitamin D and Sleep Regulation: Is there a Role for Vitamin D? — PubMed
FAQ: Melatonin and Chronic Pain
A 2026 systematic review and meta-analysis found that melatonin reduced chronic musculoskeletal pain across randomized controlled trials involving conditions such as low back pain, osteoarthritis and fibromyalgia. The average improvement was about nine points on a 100-point pain scale. Researchers say melatonin may be useful as an addition to a broader pain-management plan rather than a replacement for other treatments.
It may. The review found improvements in both chronic musculoskeletal pain and sleep quality. That’s potentially valuable because pain and poor sleep often reinforce one another, with pain interfering with rest and sleep loss increasing pain sensitivity
In the chronic musculoskeletal pain trials, doses generally ranged from 3 to 10 mg, with 3 mg the most common. Researchers did not find a clear dose-response relationship, so the study does not establish one ideal dose for pain relief.
Melatonin was generally well tolerated in the studies reviewed, with nausea, dizziness and headache among the most commonly reported side effects. However, the researchers specifically describe the evidence for short-term safety and recommend discussing melatonin with a healthcare professional, especially if you take medications or have underlying health conditions.
Low vitamin D levels have been associated with sleep problems, and research suggests vitamin D plays a role in circadian regulation. Vitamin D also influences inflammatory and pain-signaling pathways, which may be one reason low vitamin D status is often associated with greater pain. Correcting a deficiency may therefore support both sleep and pain management, although vitamin D isn’t a substitute for treating the underlying cause of chronic pain.
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