Nov 9, 2026 · @Yoon Hang Kim MD

Yoon Hang Kim MD Board-Certified in Preventive Medicine | Integrative & Functional Medicine Physician

About Dr. Kim

Dr. Kim is a board-certified preventive medicine physician with over 20 years of clinical experience. A University of Arizona/Andrew Weil fellowship-trained integrative medicine specialist, he holds additional certifications in medical acupuncture and integrative and holistic medicine. His clinical focus includes low dose naltrexone (LDN), autoimmune conditions, chronic pain, integrative oncology, fibromyalgia, chronic fatigue syndrome, mast cell activation syndrome (MCAS), and mold toxicity. He is the author of 8 books and more than 25 peer-reviewed articles.

Professional: www.yoonhangkim.com | Clinical: www.directintegrativecare.com

Important: This article is for educational purposes only and does not constitute medical advice. Always consult your healthcare provider before making changes to your treatment plan or starting new supplements.

Why Sleep Deserves More Than a Supplement Stack

If you've been struggling with sleep, you've probably already Googled your way through a dozen "natural sleep stacks" — magnesium, theanine, glycine, maybe some melatonin for good measure. And I get it. When you're lying awake at 2 a.m. staring at the ceiling, you want something you can take tonight that will help.

But here's what I've learned after two decades of working with clients who can't sleep: the supplement is almost never the starting point. The real question isn't what should I take? — it's why can't I sleep?

That shift in thinking changes everything. An evidence-based functional medicine approach to sleep starts with identifying what's actually going on, strengthens your body's natural circadian rhythms, and leans on cognitive behavioral therapy for insomnia (CBT-I) as the primary intervention — with supplements used selectively, not as the foundation.

In this article, I'll walk you through the approach I use in my own practice — one that honors the functional medicine principle of finding the root contributor while staying grounded in what the evidence actually shows.

Start with the Sleep Pattern — Not a Supplement

The first thing I want to understand is what kind of sleep problem we're dealing with. Is it trouble falling asleep? Waking up repeatedly through the night? Waking too early and not being able to get back to sleep? Or sleeping a full night but still feeling exhausted?

These patterns aren't just frustrating — they point toward different contributors, and none of them identifies a single "root cause" by itself. That's why I start here before reaching for any intervention.

Before attributing sleep problems to cortisol imbalances, nutrient deficiencies, or microbiome disruption, it's important to review sleep-disrupting medical conditions and medications. Sleep apnea and restless legs syndrome are especially important to identify early. A structured behavioral sleep program — even a self-guided one — can be genuinely unsafe for people with untreated sleep apnea, bipolar disorder, seizure disorders, parasomnias, excessive daytime sleepiness, or significant fall risk.

A practical starting assessment includes:

• A sleep diary documenting bedtime, estimated sleep onset, awakenings, wake time, and how you feel during the day
• An insomnia symptom measure such as the Insomnia Severity Index (ISI)
• A review of disruptors — caffeine, alcohol, nicotine, medications, current supplements, and the sleep environment itself

This isn't busywork. The sleep diary alone often reveals patterns that neither you nor your clinician would have noticed without it. And it becomes essential for tracking whether anything we do next is actually helping.

CBT-I: The Most Underused Tool in Sleep Medicine

If there's one thing I want you to take away from this article, it's this: cognitive behavioral therapy for insomnia (CBT-I) has a stronger evidence base than any supplement, and its benefits often persist long after treatment ends.

CBT-I is not just "sleep hygiene." It combines stimulus control (retraining your brain to associate the bed with sleep), carefully guided adjustment of time in bed, cognitive strategies for managing sleep-related worry, and consistent sleep scheduling. A typical course runs 4–8 sessions — and unlike a supplement, you don't have to keep taking it forever.

What many people don't realize is that there are excellent, free tools available right now that deliver structured CBT-I or CBT-I–based content. The VA developed several of these, and they are available to the general public — not just veterans.

An important distinction: Insomnia Coach is designed for self-care. CBT-i Coach is built to accompany treatment with a clinician — it's not a stand-alone replacement for therapy.

One caution: sleep restriction (or time-in-bed compression) is a core part of CBT-I, but it shouldn't be treated as simply "sleep less." Clients with untreated sleep apnea, bipolar disorder, seizure disorders, or significant fall risk should work with a clinician before using that component.

Supplements: What the Evidence Actually Says

Let me be direct: no supplement below has evidence comparable to CBT-I for chronic insomnia. Benefits are generally modest, studies are often short, and improvement on a sleep questionnaire doesn't necessarily mean you're objectively sleeping deeper or longer. That said, several options are worth knowing about — with honest context.

Melatonin is better understood as a circadian timing signal than a universal sleep pill. It may modestly shorten the time it takes to fall asleep, but it doesn't reliably improve nighttime wakefulness or overall sleep quality. Clinical guidelines cited by the National Center for Complementary and Integrative Health (NCCIH) actually recommend against routine use for chronic insomnia. Where melatonin shines is circadian-timing problems — jet lag, certain shift-work situations — where the timing of the dose matters more than the dose itself.

Saffron has emerging short-term evidence worth discussing. A 120-person randomized trial found that a standardized saffron extract improved selected subjective sleep outcomes over 28 days, though not all measures improved and the higher dose wasn't clearly better than the lower one. This is promising — but it's still short-term, subjective data, and a kitchen saffron product is not interchangeable with the studied standardized extract.

L-theanine is an amino acid found in tea that may help when evening tension or mental rumination is a prominent feature. A systematic review and meta-analysis now exists, but the evidence remains less established than CBT-I, and studies differ in formulation and population.

Magnesium is most defensible when there's a reason to suspect low intake or another indication for supplementation. Sleep benefits are uncertain and generally modest. An important detail many people miss: what matters is the amount of elemental magnesium — not the total weight on the label. Kidney disease warrants particular caution.

Glycine has very preliminary evidence for subjective poor or unrefreshing sleep. It should not be described as a proven way to increase deep sleep.

Valerian, chamomile, passionflower, and lavender fall into the relaxation-oriented adjunct category. Evidence is limited or inconsistent. The American Academy of Sleep Medicine guideline does not recommend valerian for insomnia.

For specific dosing guidance on any of these, visit ifmsynergy.com — I go into much more clinical detail there.

My Clinical Take

If a client wants to try a supplement, I recommend trialing one at a time with a clear target: shorter sleep latency, fewer awakenings, improved perceived restoration, or better daytime function. We set a defined trial period and reassess. "Natural" does not mean proven safe or effective — NCCIH emphasizes discussing any complementary sleep approach with a clinician. And combining multiple supplements into a "stack" without individual evaluation isn't evidence-based practice, no matter how many wellness influencers endorse it.

Other Non-Drug Tools Worth Incorporating

Circadian and Environmental Support

These are the foundations that make everything else work better. None of them is glamorous, and none of them will go viral on social media — but they matter.

• Keep a consistent sleep and wake schedule — even on weekends. Your circadian clock doesn't know it's Saturday.
• Get outdoor light exposure during the day, especially in the morning. This is one of the most powerful circadian signals we have.
• Reduce bright artificial light near bedtime. Blue-light glasses are debatable, but dimming the lights in the evening is not.
• Create a quiet, dark, comfortably cool bedroom. Blackout curtains and a cooler room temperature do real work.
• Limit caffeine, nicotine, alcohol, large meals, and strenuous exercise close to bedtime when they interfere with sleep.

These measures support treatment, but let me be clear: sleep hygiene alone is not equivalent to CBT-I. Telling someone with chronic insomnia to "just practice good sleep hygiene" is like telling someone with clinical depression to "just think positive." It's necessary but insufficient.

Relaxation and Mind-Body Approaches

Progressive relaxation, breathing practices, and guided imagery can support the pre-sleep wind-down. Yoga and tai chi may improve sleep quality, though the evidence is less convincing for treating insomnia itself. Meditation apps can be useful adjuncts, but they should not be confused with a structured CBT-I program.

Relaxation alone has limited, low-quality evidence for insomnia. Its strongest role is typically within a broader behavioral program — not as a stand-alone treatment.

Devices and Temperature Tools

Cooling mattress pads, weighted blankets, and light-management devices can address comfort or environmental problems. Neuromodulation devices are discussed in integrative sleep literature, but their evidence and regulatory status vary by device — they should not be lumped together as established insomnia treatments.

These tools can be helpful additions, but they should never displace proper evaluation and CBT-I.

Putting It All Together: A Practical Sequence

Here's the approach I use in my own practice. It keeps the functional medicine emphasis on individualized contributors while anchoring treatment in the interventions with the strongest evidence — rather than escalating supplements without a clear outcome measure.

1. Characterize the problem and establish a baseline using a sleep diary and an insomnia symptom score like the ISI.
2. Evaluate for treatable contributors — particularly sleep apnea, restless legs syndrome, and other relevant medical or psychiatric conditions.
3. Start structured CBT-I. For many clients, Insomnia Coach is a strong starting point. For those working with a clinician, CBT-i Coach provides excellent support.
4. Strengthen the circadian foundation — consistent scheduling, daytime light exposure, an appropriate sleep environment, and a repeatable wind-down routine.
5. If desired, trial one supplement at a time with a predefined target: shorter sleep latency, fewer awakenings, improved perceived restoration, or better daytime function.
6. Reassess after several weeks. Continue only interventions with a meaningful benefit and acceptable tolerability. Drop the rest.

This is the sequence that keeps you honest. It's tempting to start with a supplement stack — it feels like doing something. But the strongest tools in sleep medicine are behavioral, not pharmacological and not nutraceutical. The supplements are the supporting cast, not the lead.

Work with Dr. Kim

If you're dealing with sleep problems that haven't responded to the usual advice — or if you suspect there's an underlying condition contributing to poor sleep — I'd welcome the opportunity to work with you. My membership-based telemedicine practice serves clients in Iowa, Illinois, Missouri, Georgia, Florida, and Texas.

Learn more or schedule a consultation at www.directintegrativecare.com.

For professional inquiries, speaking, or consulting: www.yoonhangkim.com.

References

1. National Center for Complementary and Integrative Health (NCCIH). Sleep Disorders and Complementary Health Approaches. nccih.nih.gov
2. U.S. Department of Veterans Affairs. Insomnia Coach Mobile App. ptsd.va.gov
3. U.S. Department of Veterans Affairs. CBT-i Coach for Clinicians. ptsd.va.gov
4. U.S. Department of Veterans Affairs. CBT-i Coach (Public). ptsd.va.gov
5. U.S. Department of Veterans Affairs. Sleep Problems in Veterans. ptsd.va.gov
6. Lopresti AL, Smith SJ, Metse AP, Drummond PD. Effects of saffron on sleep quality in healthy adults with self-reported poor sleep: a randomized, double-blind, placebo-controlled trial. J Clin Sleep Med. 2021. PubMed 34438361
7. Turkozu D, Sanlier N. L-theanine, unique amino acid of tea, and its metabolism, health effects, and safety. Crit Rev Food Sci Nutr. Systematic review/meta-analysis. ScienceDirect
8. Healing Works Foundation. Integrative Approaches for Better Sleep: Pocket Guide. healingworksfoundation.org

Yoon Hang Kim MD is the author of MCAS: Epidemic in Plain Sight and LDN Primer*, both available on Amazon. He is the founder of the* LDN Support Group, a community of more than 10,000 members.