Melatonin isn’t a sleep aid, it’s a sleep signal — and taking it nightly at high doses may do more to disrupt your natural rhythm than restore it. In this episode, neurosurgeon Dr. Ravi Kumar walks through what melatonin actually does in the body, why most bottles don’t contain what they claim, and two blood tests — Lp(a) and ApoE4 — worth requesting from your doctor exactly once.
You can also listen to the audio here. Also available on Spotify and Apple
Prefer reading? Get the episode transcript here:
Why doesn’t Dr. Kumar recommend melatonin for sleep?
Melatonin is a signaling hormone released by the pineal gland to tell the body it’s time to sleep — not a sedative. Dr. Kumar explains that because it’s a signal rather than a knockout drug, flooding the system with extra melatonin nightly doesn’t improve sleep quality the way people assume, and long-term daily use may interfere with the body’s own signaling over time.
Where he does recommend it:
- Jet lag — resetting the circadian clock after crossing time zones
- Shift work — recalibrating sleep-wake timing after a schedule change
- “Social jet lag” — getting back on track after a weekend of late nights
- Blind individuals — who don’t receive the light cues that regulate melatonin naturally
In each case, the approach is the same: use it briefly to nudge the rhythm back into place, then stop.
What’s the right melatonin dose?
This is where most people get it wrong. Commercial products often contain 5, 10, or even 20 milligrams — doses Dr. Kumar says are far beyond what the body needs. The effective range to replicate a natural melatonin signal is closer to 0.5 to 1 milligram.
There’s a second problem: independent testing has repeatedly found major gaps between what melatonin labels claim and what’s actually in the bottle, with some products containing dramatically less — or, in some cases, several times more — than stated. Dr. Kumar’s recommendation is to choose products carrying USP (U.S. Pharmacopeia) or NSF certification, since both organizations independently test supplements for label accuracy.
Does melatonin cause heart failure?
A recent observational study found that people taking melatonin daily for more than a year had notably higher rates of heart failure than non-users — but Dr. Kumar is clear about what that finding does and doesn’t mean. Observational data shows correlation, not causation, and the biological mechanism connecting melatonin to heart failure isn’t understood.
He also flags reverse causation as a real possibility: people developing early heart issues may sleep worse and turn to melatonin as a result, rather than melatonin causing the problem. His bottom line — occasional or short-term use appears safe, but long-term daily use hasn’t been cleared, and the honest answer right now is that the jury’s still out.
Are prescription sleep aids like Ambien or Benadryl safe long-term?
Short answer: not for extended use. Dr. Kumar breaks down three common categories:
- Benzodiazepines (Valium, Ativan, Xanax) — highly addictive, act on GABA receptors, and require medically supervised tapering to stop safely
- Z-drugs (Ambien, Lunesta) — developed as a “safer” alternative to benzodiazepines, but carry black-box warnings for behaviors like sleepwalking, and the body builds tolerance quickly, making them less effective the longer they’re used
- Antihistamines (Benadryl, Tylenol PM) — block acetylcholine, the neurotransmitter tied to cognition, meaning the cognitive fog persists even after the sedating effect wears off with continued use
His guidance: none of these are designed for long-term use, and a night or two during a genuine crisis is very different from reaching for them nightly.
What is Dr. Kumar’s actual sleep protocol?
- Cut screens two hours before bed — or if that’s not realistic, move the screen further away (a TV, not a phone) to reduce blue light hitting the eyes directly
- Take a warm shower before bed — the post-shower drop in core body temperature helps trigger sleep onset
- Wear socks to bed — warming the feet allows the rest of the body to cool, which supports falling asleep faster
- Keep the bedroom cool — around 68°F has been shown to improve sleep quality on EEG measurements
- Consider CBT-I (Cognitive Behavioral Therapy for Insomnia) for chronic insomnia — Dr. Kumar calls it one of the most effective behavioral therapies available for any condition
What is Lp(a), and why does it matter?
Unlike LDL, HDL, or triglycerides, Lp(a) is genetic — diet and exercise don’t change it. It’s a protein that historically helped wounds clot and stay clotted, which was an advantage for survival. The problem now: Lp(a) interacts with oxidized fats — including seed oils — in ways that can promote inflammation and interfere with the body’s ability to break down clots, contributing to elevated cardiovascular risk.
Dr. Kumar notes that people with high Lp(a), himself included, face meaningfully higher rates of heart attack — but stresses it isn’t destiny. In the context of a metabolically healthy, low-inflammation lifestyle, elevated Lp(a) is far less likely to cause problems. Because it’s determined at birth, it only needs to be tested once, ever — and it isn’t part of a standard lipid panel, so patients need to ask for it specifically.
What does ApoE4 mean for Alzheimer’s risk?
ApoE4 is a gene variant associated with increased Alzheimer’s risk — carrying two copies raises risk meaningfully, while one copy raises it more moderately. But Dr. Kumar points out that the majority of people carrying ApoE4 never develop dementia. The variant likely persisted in the gene pool because it offered early-life advantages (fertility, infection resistance) even as it may carry later-life tradeoffs — a concept known as antagonistic pleiotropy.
The risk factors that turn ApoE4 into a problem are the same ones driving chronic inflammation generally: metabolic dysfunction, high blood pressure, smoking, low muscle mass, inactivity, social isolation, and uncorrected vision or hearing loss. Managing those factors significantly changes the odds regardless of genotype.
Want the full sleep protocol? Download Dr. Kumar’s complete sleep guide at drkumardiscovery.com, and listen to the full conversation for the story behind his year practicing neurosurgery in rural India — the experience that reshaped how he thinks about medicine altogether.
About the Host
I, Greg Cox, have been working in the wellness space for 20+ years and was a chef for 25 years before that, often creating health meals for restaurants and as a private chef. I created the Rebellious Wellness Lifestyle Podcast to empower women to challenge the limitations society places on them as they age.
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