Melatonin: What Most People Get Wrong About the “Sleep Hormone”
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Melatonin gets treated like a sleep switch. It is not. It is more like the starter pistol at the beginning of a race.
Melatonin is a hormone your brain makes in response to darkness. Its main job is to signal timing. It tells your body that night has started and that sleep should begin. That matters because sleep is not just about feeling tired. It is when the brain clears waste, the body repairs tissue, and the nervous system shifts out of daytime mode.
What melatonin actually does
Melatonin is produced mainly by the pineal gland in the brain. Darkness helps it rise. Light at night can suppress it. That is why bright screens, room light, and even small LEDs can work against sleep.
Here is the part most people get wrong: melatonin helps with sleep timing more than sleep depth. In simple terms, it can help you fall asleep. It is much less reliable for helping you stay asleep all night.
That is why many sleep experts focus first on light control, routine, and sleep environment. Matthew Walker has repeatedly emphasized that darkness is a biological signal, not just a mood setting. Chris Surel also speaks often about recovery starting with the basics, not hacks.
Why supplements get messy
Melatonin supplements are everywhere. The problem is not just whether they work. It is that the dose is often all over the place.
NIH and NCCIH note that melatonin may help in specific cases like jet lag or delayed sleep phase, but there is not strong evidence to recommend it broadly for chronic insomnia. A 2023 JAMA study found that 22 of 25 melatonin gummies were inaccurately labeled. Actual melatonin content ranged from 74% to 347% of what the label claimed. One product had no detectable melatonin at all.
That matters because very small amounts can already raise melatonin into the normal nighttime range. Yet many commercial products sell much higher doses. Bryan Johnson, for example, publicly reports using a very low dose of around 300 micrograms, which is far below the common 3 to 10 mg products sold in stores.
The kiwi question
Kiwifruit is interesting because it contains melatonin along with serotonin and antioxidants. Research suggests that eating two kiwis about an hour before bed may improve sleep quality, sleep efficiency, and total sleep time in some people. That does not make kiwi a magic sleep cure. But it does support a food-first idea: sometimes better sleep starts with better signals, not stronger supplements.
The real takeaway
If you struggle to fall asleep, melatonin may help with timing. If you struggle to stay asleep, melatonin may not be the answer.
Before reaching for a bigger dose, start with the fundamentals:
- Get darker nights
- Reduce light before bed
- Keep a regular sleep window
- Cool the room
- Treat sleep as a system, not a supplement problem
Melatonin is important. But it is not the whole story. The hormone can start the process. It cannot replace the conditions your biology needs to sleep well.
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Because better nights start with better knowledge.
