Melatonin: the most popular sleep aid that often doesn’t work
Melatonin has grown into one of the best-selling supplements in the Netherlands. The promise is simple: take a tablet and you sleep like a log. But for many people with chronic sleep problems, melatonin is disappointing.
What melatonin does and doesn’t do
Melatonin is a hormone your body produces itself. It tells your body that it’s dark and it’s time to go to sleep. It doesn’t knock you out like a sleeping pill; it only gives the signal “it is night now.”
Melatonin works well for: jet lag, a shifted sleep rhythm (you only fall asleep at 02:00 or 03:00), and blind people with a disrupted day-night rhythm.
Melatonin usually doesn’t work for: chronic insomnia (lying awake, rumination), stress-related sleep problems, sleep anxiety, and sleep apnoea.
The reason: in chronic insomnia the problem is usually not that your body produces too little melatonin. The problem lies in your behaviour, your thoughts, or your nervous system.
The dosage myth
Many people think: “if 0.3 mg doesn’t work, I’ll take 5 mg.” But research shows higher doses are not more effective. Your body produces about 0.1 to 0.3 mg of melatonin itself. A 3 mg or higher supplement gives you 10 to 30 times the natural amount. This can overload your receptors, making them less sensitive.
The optimal dose according to sleep scientists is 0.3 to 0.5 mg, taken 1 to 2 hours before your desired bedtime.
Side effects nobody mentions
Morning grogginess: a dose that’s too high can leave you groggy and foggy the next morning.
Disrupted natural production: long-term use can reduce your own melatonin production.
Vivid dreams or nightmares: melatonin can influence your REM sleep.
Psychological dependence: “without my melatonin I can’t sleep” becomes a self-fulfilling prophecy.
What does work for chronic insomnia?
CBT-I: the proven approach
Cognitive behavioural therapy for insomnia is identified by science as the most effective treatment for chronic insomnia. It addresses the underlying causes and delivers lasting results.
Sleep restriction
The most powerful technique from CBT-I. By temporarily limiting your time in bed, you build sleep pressure. Your body learns to sleep efficiently again.
Light therapy
If your sleep rhythm is shifted, morning light can be more effective than melatonin. Go outside within 30 minutes of waking or use a 10,000 lux light therapy lamp.
The science behind melatonin and sleep
To understand why melatonin doesn’t work for chronic insomnia, you need to know how your sleep-wake system functions. Sleep is regulated by two independent systems: your circadian rhythm (biological clock) and your sleep pressure (homeostasis).
Your circadian rhythm is driven by the suprachiasmatic nucleus (SCN) in your hypothalamus. This “master clock” responds to light and dark, and tells your pineal gland when to produce melatonin. In the evening, as it gets dark, your melatonin level rises. In the morning, as it gets light, it drops again.
Your sleep pressure builds up during the day through the accumulation of adenosine in your brain. The longer you’re awake, the more sleep pressure you build. This system works independently of melatonin.
In chronic insomnia, the problem is usually not your circadian rhythm (your body produces enough melatonin at the right time), but your behaviour and thoughts. You lie in bed ruminating, you’ve developed sleep anxiety, or your sleep rhythm is disrupted by bad habits. Extra melatonin doesn’t solve any of these problems.
Melatonin vs sleeping pills: what’s the difference?
Many people put melatonin in the same category as sleeping pills, but they work fundamentally differently:
Melatonin is a chronobiotic: it shifts your biological clock. It doesn’t make you directly sleepy, but tells your body it’s night. Effect occurs after 30 to 120 minutes and is subtle.
Benzodiazepines (temazepam, oxazepam) are sedatives: they suppress your central nervous system. You fall asleep quickly, but the sleep is of lower quality. They’re addictive and only prescribed for short durations.
Z-drugs (zolpidem, zopiclone) work similarly to benzodiazepines but with slightly less addiction risk. Still, they’re not suitable for long-term use.
None of these agents address the underlying cause of insomnia. Only behavioural change does, and the most effective form is CBT-I.
Natural alternatives that sometimes help
Magnesium
Magnesium plays a role in activating your parasympathetic nervous system (your “rest mode”). A magnesium deficiency can contribute to poor sleep. A supplement of 200 to 400 mg magnesium bisglycinate before bed can help if you have a deficiency. It’s not a miracle cure, but it can contribute as part of good sleep hygiene.
Valerian
Valerian is one of the oldest herbal sleep remedies. The scientific evidence is mixed: some studies find a small positive effect, others don’t. It’s safe for short-term use but not proven effective for chronic insomnia.
L-theanine
An amino acid naturally found in green tea. L-theanine promotes relaxation without causing sleepiness. It can help calm your thoughts before bed, but it’s not a sleep aid.
When melatonin is worth considering
Melatonin isn’t useless, but it’s a tool for specific situations: jet lag, a consistently late sleep rhythm, or as temporary support (maximum 2 to 4 weeks). Always use a low dose (0.3-0.5 mg) and take it 1 to 2 hours before your desired bedtime.
The step towards real improvement
If you’ve been taking melatonin for weeks without results, that’s actually good news: it means you’re ready for an approach that does work. CBT-I is well researched for chronic insomnia, without the side effects of sleep medication, and its results often last.
At Slaapanker you can work with a certified sleep exercise therapist via video consultation. No pills, no supplements, but a well-founded approach aimed at structurally improving your sleep.