How much melatonin should you take to sleep better?
If you want to try melatonin for difficulty falling asleep, 4 mg taken 3 hours before bedtime gives the best chance of effect; if you are 55 or older, only the extended-release form is officially recommended. Always discuss this with your doctor, as it concerns the treatment of a sleep disorder.
Want to try melatonin to sleep better? Then when you take it matters more than how much. An analysis of 26 studies involving more than 1,600 participants shows that the effect peaks at 4 mg per day, but that taking it 3 hours before bedtime makes more difference than the exact dose. Most people take it 30 minutes beforehand: that is suboptimal. Because this is a sleep aid for a sleep disorder, we discuss it further as medical information.
On the label you are looking for 'melatonin' with a dose between 0.3 mg and 5 mg, as a fast-acting capsule or tablet. If you are 55 or older, extended-release melatonin is the only form recommended by the European guideline for insomnia, for a maximum of 3 months. Fast-acting melatonin is explicitly discouraged by that same guideline for insomnia. In research, adults aged 55 and over received 5 mg per day and saw a measurable improvement in their sleep efficiency; 0.3 mg produced no noticeable effect. Discuss which dose and form suits you with your doctor. Where you can buy it depends on the country: in the United States melatonin is sold freely as a supplement, in the United Kingdom it is prescription-only, and in much of the EU only low doses are sold freely while higher doses count as medicines.
The brand on the packaging does not matter. Whether you are male or female, or what you eat, also makes no difference to the effect based on the available research. Do manage your expectations: large comparative analyses place melatonin at the bottom of the ranking of sleep aids, clearly less effective than other options.
Melatonin is safe for most adults when used short-term; mild side effects such as dizziness or headache are comparable to a placebo. Pregnant women and women who are breastfeeding are advised not to use it due to a lack of safety data. In children and older adults, long-term use has not been sufficiently studied. Melatonin production declines with age, but the evidence that supplementation actually restores sleep quality is limited and inconsistent. Higher doses are pharmacological: they produce blood levels that your body would never generate on its own, and too little is known about long-term safety.
Based on one dose-response meta-analysis (26 RCTs, n=1689), the European insomnia guideline (2023), a crossover study in older adults, a European paediatric expert panel (with declared conflicts of interest) and several narrative reviews. No large independent RCTs exist for higher doses or long-term safety.
Does melatonin improve sleep in older age?
For older people with sleep complaints, particularly waking up too early, melatonin offers a modest but real benefit. The effect varies by person and complaint, so always discuss use and duration with your doctor.
Is it safe to take melatonin every night?
For healthy adults, melatonin is relatively safe with short-term use, but as a sleep aid for chronic insomnia it works considerably less well than standard sleep medicines. Pregnant women, breastfeeding women, and children outside a medical indication are better off avoiding it.
How much sleep do I really need?
Seven to eight hours per night is the best-supported target range for adults. If you are consistently sleeping fewer than 7 hours, getting more sleep is not a luxury but a serious investment in your health.
What can I do to sleep better?
CBT-I is the most powerful approach for persistent sleep problems; if you do not have access to it, ask your general practitioner about a shorter behavioural treatment of four sessions. Fixed sleep times, less caffeine and alcohol in the evening, and regular exercise are the best-supported self-help steps.
Does magnesium really help you sleep better?
Magnesium may be worth trying for sleep problems, but the evidence is limited and the studies are partly contradictory. At normal doses it is safe; in any case, make sure you get enough through your diet.
When should you take magnesium for sleep?
Take magnesium about an hour before bedtime, but do not expect a guaranteed effect: the evidence is thin and a substantial placebo effect is likely playing a role.