Melatonin and Sleep Disorders: What Does the Science Say?

Trouble falling asleep, nocturnal awakenings or jet lag? Melatonin, dubbed the "sleep hormone", is often studied as a supplement. Its effectiveness depends on the dose, the time of intake, and the type of sleep disorder. Here's what clinical research says and how to use it intelligently.

What is melatonin?

Melatonin is a hormone naturally secreted by the pineal gland, especially in the evening in the absence of light. It plays a role in regulating the sleep-wake cycle [1].

👉 Its production decreases with age and can be disrupted by screen exposure, stress, and irregular schedules.

What sleep disorders are concerned?

• Difficulty falling asleep: Several studies suggest that taking it before bedtime can moderately reduce the time it takes to fall asleep [2].
• Jet lag: Documented for use by EFSA to alleviate the effects of jet lag when taken at local bedtime [3].
• Rhythm disorders (shift work, elderly people): Studied to regulate disrupted biological rhythms [4].

⚠️ Data is less convincing for nocturnal awakenings or psychologically induced insomnia, for which cognitive-behavioral therapy remains the first-line treatment.

What dose?

The thresholds studied in EFSA opinions are between 0.5 mg and 1.9 mg, taken close to bedtime [3]. In France, the over-the-counter sale of melatonin is regulated (maximum dosage for food supplements is regulated); it is advisable to check the regulations in force and ask for advice if in doubt.

What clinical studies show

• A meta-analysis of 19 clinical trials reported a moderate reduction (of the order of a few minutes on average) in sleep onset latency in adults taking melatonin [2].
• A study in shift workers reported an improvement in certain sleep indicators [4].

Practical advice

• ⏱ Take in moderate doses, close to bedtime, respecting authorized dosages [3]
• 💡 Reduce exposure to blue light (screen, LED) in the evening [1]
• 🚫 Do not combine with sedatives without medical advice
• 📆 Short course, to be re-evaluated with a healthcare professional in case of prolonged use

Solutions available on Pharmaplusfrance.store

We do not currently offer any pure melatonin supplements on the site. Here are the natural alternatives actually available:

• Valerian Root 500 mg, Vegetable Capsules (NOW Foods)
• Calm Magnesium Glycinate, 90 capsules (Natural Vitality)
• P-5-P, Active Vitamin B6 (NOW Foods)

Conclusion

Melatonin can, according to the literature, help moderately reduce the time it takes to fall asleep or alleviate jet lag, provided that the regulated dosages and indications are respected. In the absence of a melatonin-based supplement on our site to date, valerian and magnesium remain natural options studied to support sleep.

Scientific references

1. Arendt J. Melatonin and human rhythms. Chronobiol Int. 2006;23(1-2):21-37.
2. Ferracioli-Oda E, Qawasmi A, Bloch MH. Meta-analysis: the efficacy of melatonin for sleep disorders. PLoS One. 2013;8(5):e63773.
3. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on the substantiation of health claims related to melatonin. EFSA Journal. 2010.
4. Sletten TL et al. Melatonin for the treatment of shift work disorder. Sleep. 2017. (source à vérifier)

---