Melatonin For Sleep: What The Evidence Actually Says

Melatonin is the most-searched sleep supplement in India and one of the most overpromised. This is the evidence, sorted by how strong it actually is.

Strong: shifting your body clock

This is where melatonin has genuine, consistent support.

Trials on jet lag, shift work adaptation and delayed sleep phase repeatedly find melatonin 
helps move the circadian clock in the intended direction. The mechanism is 
well understood and the findings hold across multiple studies.

This is what melatonin is for. Everything below is a weaker claim.

Moderate: falling asleep faster

Meta-analyses of melatonin for sleep onset generally find a real but modest effect —
typically reducing the time taken to fall asleep by somewhere in the range of seven to twelve 
minutes compared with placebo.
That is statistically real and clinically minor. If you currently take an hour to fall asleep, 
melatonin is unlikely to make that fifteen minutes.
Being upfront about this matters, because people who expect a dramatic effect conclude the 
product failed when it performed exactly as the research predicted.

Weak: staying asleep

Standard immediate-release melatonin has a short half-life and clears within a few hours.
If your problem is waking at 3am and lying there, melatonin taken at 11pm has largely 
gone by then. The evidence for improving sleep maintenance with immediate-release 
melatonin is poor.
Extended-release formulations address this differently and are worth discussing with a 
doctor if maintenance is your issue.

Weak: total sleep duration

Effects on total time asleep are small in most analyses — often in the region of eight to 
twenty minutes.
Again, real but modest. Melatonin is not adding an hour to your night.

Where it works better than average

Some groups show larger effects, which is worth knowing:

• People with genuinely delayed circadian timing rather than ordinary difficulty 
  sleeping
• Shift workers attempting daytime sleep
• Travellers crossing multiple time zones
• Older adults, whose natural production has declined substantially
• People whose sleep problem is clearly light-related — late screen exposure, irregular 
  schedules

If you are in one of these groups, expect more. If you are not, calibrate accordingly

Where it does not work

• Insomnia driven by anxiety or rumination — the clock is not the problem
• Sleep apnoea, which is common in India and substantially under-diagnosed
• Pain-related waking
• Restless legs
• Poor sleep from alcohol, which fragments the second half of the night regardless

Melatonin will not touch any of these, and months spent trying is time not spent on the actual cause.

What the evidence says about how to use it

• Low doses work as well as high ones. 0.5 mg to 3 mg covers most of the research.
• Timing matters more than dose. 60 to 90 minutes before target sleep.
• Light exposure afterwards undermines it — dim the room.
• Consistency over a week beats a single night's trial.
• It works best combined with light management rather than as a standalone.

An honest summary

Melatonin is a good tool for a specific job: realigning a clock that has drifted. For that, the 
evidence is solid.

For general 'I want to sleep better', the effect is real but small, and light exposure and a 
consistent schedule will out-perform it.

This article is for general information and is not medical advice. Consult a qualified doctor 
about persistent sleep difficulty.