Melatonin and Sleep Supplements: What Works and What Doesn't

By the KABO Nutrition Team · fact-checked against cited public-health sources.

Melatonin is a timing signal, not a sedative — it is genuinely useful for jet lag and shifted body clocks, and largely ineffective for ordinary insomnia. Most sleep supplements have thin evidence, and behavioural approaches outperform all of them for chronic sleep problems.

What melatonin actually does

Melatonin is a hormone the pineal gland releases as darkness falls. Its function is to signal to the body that night has begun — it is a clock signal, not a sedative like a sleeping pill.

This distinction explains most of the disappointment people report. Taken by someone whose body clock is already aligned and who cannot sleep because of stress, pain or an overactive mind, melatonin does very little, because the signal it provides is one the body already has.

Taken by someone whose clock is genuinely misaligned — after a long flight, or with a sleep phase that has drifted to 3am — it can be quite effective.

Dose and timing, which are usually wrong

The common assumption is that more works better, and products are sold at 5mg and 10mg accordingly. Research generally finds low doses of around 0.5 to 3mg as effective as higher ones, with higher doses more likely to produce next-morning grogginess.

• For jet lag — take it at the target bedtime in the destination time zone.
• For a delayed sleep phase — take it several hours before the desired bedtime, not at it.
• For occasional use — 0.5 to 3mg, roughly 30 to 60 minutes before intended sleep.
• Combine with light exposure: bright light in the morning at the destination does at least as much work.
• Note that in India melatonin availability and regulation differ from the US supplement market; check what you are actually buying.

The other supplements, briefly

• Magnesium — plausible mechanism, and genuinely useful if you are deficient. Evidence in non-deficient people is weak.
• Valerian — long tradition, mixed and generally low-quality evidence.
• Chamomile — mild, mostly a comforting ritual, which is not worthless.
• Ashwagandha — some studies show modest improvement in sleep quality and stress measures; better evidence than most in this list, though studies are often small.
• L-theanine — modest evidence for relaxation, mainly alongside caffeine.
• Antihistamine sleep aids — effective short-term, but tolerance develops quickly and next-day impairment is common.

What actually fixes chronic sleep problems

For insomnia lasting more than a few weeks, cognitive behavioural therapy for insomnia (CBT-I) is the first-line treatment in clinical guidelines, and it outperforms medication over the long term — including after treatment stops, which medication does not.

• Consistent wake time every day, weekends included; this anchors the whole system.
• Get bright light within an hour of waking.
• Keep the bedroom dark and cool; heat is a significant factor in Indian summers.
• No caffeine after early afternoon — its half-life is around five to six hours.
• Get out of bed if awake for more than about twenty minutes, rather than lying there.
• Reserve the bed for sleep, so the association stays intact.

When to see a doctor

Supplements are the wrong tool for several common causes of poor sleep, and taking them delays diagnosis.

• Loud snoring with pauses in breathing, or waking unrefreshed despite adequate time in bed — possible sleep apnoea.
• Uncomfortable leg sensations at night — possible restless legs, often linked to iron deficiency.
• Insomnia lasting more than three months.
• Sleep problems alongside persistent low mood or anxiety.
• Daytime sleepiness severe enough to affect driving or work.

Sleep apnoea in particular is substantially under-diagnosed in India and is not something any supplement addresses.

Frequently asked questions

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