Melatonin is often seen as the miracle remedy for better sleep, but in reality it is more of a hormoon van duisternis than a sleep button. It tells your body that it is night, without actually sedating you.
In addition to melatonin, more and more people are choosing natural supplements to improve their night’s rest — from magnesium and glycine to valerian. Some help a bit, others barely, but almost never the way you think.
5 Key Points Upfront
- Melatonin does not work as a sleeping pill, but as a night signal for your biological clock.
- Most people take too high a dose of melatonin or at the wrong time.
- Magnesium and glycine can support sleep, but do not treat insomnia.
- Many supplements vary greatly in active amount due to limited quality control.
- Too high expectations of ‘natural’ remedies often lead to disappointment in the effect.
Melatonin: more night than sleep
Melatonin is not a classic sleep hormone, but a biologisch tijdsignaal that tells the body it is dark. It mainly helps you fall asleep by reinforcing the night cycle, not because it is sedative itself.
Research shows that melatonin is mainly useful for a verstoord circadiaan ritme — denk aan jetlag of ploegendienst (PubMed). In real insomnia, where so-called ‘conditioned arousal’ plays a role, it has barely any effect.
Dosering en timing: waarom minder vaak meer is
Most people take melatonin too late or in too high a dose. A small amount (0.3–1 mg) an hour before bedtime often appears most effective according to Sleep Foundation. Taking more does not speed up the process, but can actually disrupt it.
The quality of supplements also varies greatly. Studies found that some products contained up to 100× more melatonin than indicated on the label (NIH). Major brands do comply with the law, but due to shelf-life adjustments a fresh pill often contains more than the label states.
Pros and cons of melatonin
Voordelen
- Can help with jet lag or a shifted sleep rhythm.
- Supports the natural nachtritme zonder gewenning.
- Licht kalmerend effect bij juiste timing.
- Can be useful for older adults with reduced melatonin production.
Nadelen
- Ineffective for real insomnia due to geconditioneerde alertheid.
- Too high a dose can actually disrupt sleep.
- Quality differences between brands are large.
- Not suitable as a long-term solution for sleep disorders.
Other supplements that may support sleep
In addition to melatonin, substances such as magnesium, L-theanine, and glycine can improve sleep quality. Magnesium has a relaxing effect on the nervous system and may reduce nighttime muscle activity (PubMed).
Glycine has been shown in research to slightly lower body temperature and promote deep sleep (NIH). Both substances are safe, but more supportive than curative.
What does (not) yet work convincingly
Plant extracts such as valerian or lavender have mixed results. They can be calming, but verslaan zelden placebo in studies on insomnia (Frontiers in Pharmacology).
For those who only feel mild tension when falling asleep, they can provide relief. But with structural insomnia, no herb helps as long as the brain stays ‘on’.
Verklarende woordenlijst
- Conditioned arousal: Learned alertness where the brain stays awake despite fatigue.
- Circadiaan ritme: The natural 24-hour rhythm of sleep, hormones, and body temperature.
- Glycine: Amino acid that promotes relaxation and may support deep sleep.
- Magnesium: Essential mineral that contributes to supple muscles and a calmer nervous system.
Wanneer beter vermijden?
Bepaalde stoffen zoals B12 or glutamine can actually be activating and interrupt sleep. B12 strengthens the light sensitivity of melatonin — good in the morning, disruptive in the evening.
Pre-workout drinks or protein mixes with a lot of glutamine are also ‘wake keepers’. Those who train in the evening better choose glycine-rijke amino’s or a magnesium supplement with a low dose.
Conclusie
Melatonin mainly works as nachtsignaal and not as a sleeping pill. Those who use it wisely can reinforce the natural rhythm, but for insomnia it is rarely the ultimate solution.
Other supplements such as magnesium or glycine can support sleep, especially with tension or recovery after training. Ultimately, goede slaaphygiëne the most important factor — supplements complement, they do not replace anything.
Sources consulted:
- PubMed – Study on melatonin as a circadian signal for jet lag and shift work.
- Sleep Foundation – On the dosage and timing of melatonin.
- NIH – Analysis of melatonin concentrations in commercial supplements.
- NIH – Research on the effect of glycine on sleep quality and body temperature.
- Frontiers in Pharmacology – Review of herbal supplements such as valerian and lavender.
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Frequently Asked Questions
Is melatonin safe to use daily?
Yes, according to research melatonin is safe even with long-term use, provided the dosage stays low (0.3–1 mg). There is no evidence that it permanently reduces natural production.
Can magnesium really help with better sleep?
Magnesium relaxes muscles and the nervous system, which can support sleep quality. It works mainly for people with a deficiency or a lot of stress, not as a sleeping pill.
What exactly does glycine do for sleep?
Glycine may lower body temperature and promote deep sleep phases. It has no direct sedative effect, but helps with relaxation.
Does valerian really help with insomnia?
Valerian can be calming, but scientifically speaking its effect varies. It may have a mild calming effect, but no better than placebo for chronic insomnia.
When is the best time to take supplements?
Melatonin you take 30–60 minutes before bedtime. Magnesium or glycine can also be taken in the evening, preferably with dinner or after training.
