Why You Can't Sleep, and What Your Coronary Arteries Have to Do With It

Opening Scene

He sat across from me in early November and said something I have heard from enough men to stop being surprised by it.

“I used to sleep nine hours. I could sleep through anything. Now I’m staring at the ceiling at 4am thinking about a vendor contract and I have no idea how I got here.”

He was forty-four. He ran a software company he had built from twelve people to about two hundred. He had not had a vacation longer than three days in two years. He did not smoke, barely drank, exercised four times a week. He was, by all the conventional metrics, a healthy man with a sleep problem.

I ran his panel. His fasting insulin was 18.4 microunits per milliliter. His hs-CRP was 2.8 mg/L. His morning cortisol was 28 micrograms per deciliter, elevated, at the high end of normal, which in a man who woke at 5:30am and drew the blood at 8am means his cortisol awakening response had been firing hard and staying elevated well past its natural morning peak. His resting heart rate, per six months of Whoop data he brought in a screenshot, had climbed from 58 to 66 beats per minute over eighteen months.

None of those numbers individually are catastrophic. Together, they describe a man whose sympathetic nervous system is running in a state of chronic activation that his parasympathetic system cannot offset, and whose coronary arteries are being exposed, every night, to the vascular consequences of that imbalance.

He had not come to me because he was scared. He came because he had tried every sleep hygiene tip he had read, and none of them were working, and he was becoming aware that the 4am ceiling-watching was not a productivity problem. It was something else.

He was right. It was something else. I told him what it was in clinical terms that I will spend the rest of this article explaining. He left that day with a specific set of actions, not seventeen steps, not a protocol to optimize, and six months later he was sleeping seven hours consistently and his hs-CRP had dropped to 1.1 mg/L.

This is the version of the sleep conversation that does not get recorded in lifestyle magazines.

What Most Men Hide About Sleep

Men do not go looking for sleep hygiene advice. They go looking for an explanation. The phrasing in the search bar is different from the phrasing in the magazine article.

Men type: “why can’t I sleep even when I’m tired.” They type: “why do I wake up at 3am.” They post on r/adrenalfatigue: “I balanced my sleep, I adjusted my low carb diet full of healthy vegetables (no caffeine, no sugar), I started very slow cardio.” They are already doing the protocol. The protocol is not working. They want to know why.

The underlying fear is not insomnia. The underlying fear is that their body has changed in a way that cannot be reversed. That the man who could sleep anywhere on anything until he was thirty-eight is gone, and the man who stares at ceilings is who he is now. One forum member captured it precisely: “I struggle to find the motivation to keep going. Sometimes, I just wish I could escape to a remote place and do absolutely nothing for a year” (r/AskMenOver40). That sentence reads like a depression statement, and it might be. But in a man who is sleeping poorly because his HPA axis is dysregulated, the exhaustion and the loss of motivation are downstream of a physiological event, not upstream of a psychological one.

The second fear, less articulated, is that the tips they have been given are not serious enough for what they are experiencing. “No screens, cool room, consistent bedtime” is the advice a wellness magazine gives to a twenty-five-year-old who played video games until midnight. It is not the advice a practicing cardiologist gives to a forty-four-year-old with a fasting insulin of 18 and a rising resting heart rate.

A third frustration circulates specifically about Andrew Huberman: “The episodes are simply too long.” “I was fifteen minutes in and realized he hadn’t even started the episode.” “Everything Huberman could be summed up in half an hour” (r/HubermanLab). This is not anti-intellectual sentiment. It is the complaint of a man who wants a clinical signal, not a comprehensive survey. “He needs a coach to help him get to the point.” Noted.

Here is the cardiologist’s point, stated plainly: chronic sleep disruption in men over 40 is frequently not a behavioral problem. It is a neuroendocrine-vascular problem. The behavioral interventions help when the underlying physiology allows them to work. When the underlying physiology is a cortisol pattern that has been dysregulated for two years by a decade of high-performance living, behavioral interventions alone are insufficient.

The Mechanism, In Plain English

The question is not “how do I fall asleep.” The question is: what is happening in your body that is preventing sleep, and what is that same process doing to your coronary arteries.

Normal sleep requires two things to happen in sequence. First, core body temperature must drop approximately one to two degrees Celsius from its daytime peak. Second, cortisol levels must reach their nighttime nadir, the lowest point of the circadian cortisol curve, which normally occurs around midnight to 2am. When both conditions are met, the adenosine system (which accumulates “sleep pressure” throughout the day) tips the body into sleep onset and the brain cycles through the stages that accomplish the night’s biological work.

In the man who lies awake at 4am, something has interrupted step two.

The cortisol awakening response (CAR) is a 50–160% surge in cortisol levels occurring within the first 30–45 minutes after waking; it is a healthy, evolutionarily programmed response that mobilizes blood sugar, activates the immune system, and drives morning alertness. The pathological pattern in high-achieving men is not elevated morning cortisol, that is normal. The pathological pattern is cortisol that does not adequately decline through the afternoon and evening, leaving nighttime levels elevated above the threshold that permits deep sleep (Backhaus et al., Psychoneuroendocrinology, 2007). When evening cortisol remains above approximately 6–8 ng/mL in the hour before bed, the arousal threshold required to enter stage N3 (slow-wave/deep sleep) is not met. The person falls asleep but sleeps lightly. They hit 4am when the cortisol begins its natural pre-awakening rise, and instead of gradually waking at 6am as it peaks, they surface fully at 4am as it climbs.

The racing thoughts are the symptom. The elevated evening cortisol is the cause.

Now here is the part that a sleep hygiene article does not tell you.

That same elevated cortisol load is doing something to your cardiovascular system. Cortisol activates the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system simultaneously. Sympathetic activation causes vasoconstriction, raises blood pressure, increases cardiac output, and triggers platelet aggregation. A man who is running in sustained sympathetic overdrive, which is what elevated evening cortisol represents, is exposing his endothelium to nightly mechanical stress that, compounded over months and years, contributes to the development of atherosclerotic plaques (Black, Brain, Behavior, and Immunity, 2006).

The three highest-evidence sleep hygiene interventions, ranked by consistency of effect in clinical trials: (1) fixed wake time held within ±30 minutes including weekends, the single strongest circadian anchor; (2) bedroom temperature of 65–68°F (18–20°C), accelerates core body cooling required for sleep onset and increases deep sleep time; (3) morning bright light (more than 10,000 lux or outdoor light) within 60 minutes of waking, sets the adenosine and melatonin cycle timing for the next 14–16 hours. (Walker, Why We Sleep, 2017; for the temperature finding specifically, Okamoto-Mizuno & Mizuno, Journal of Physiological Anthropology, 2012). These three interventions are not the seventeen-step protocol. They are the three that actually move the needle, and they are worth doing. But in the man with dysregulated cortisol, they are necessary but not sufficient.

Beyond behavior: magnesium glycinate at 300–400 mg before bed reduces cortisol-mediated arousal through NMDA receptor modulation and has meta-analytic support for improving sleep quality (Abbasi et al., Journal of Research in Medical Sciences, 2012). This is the supplement for which the evidence most consistently supports the mechanism in this specific population. Ashwagandha (KSM-66, 300 mg twice daily) has Early-grade evidence for HPA axis modulation in clinical trials in high-stress adults, I will address the Honesty Scale rating for this explicitly below.

The sleep-cortisol-cardiovascular cycle closes this way: poor sleep further elevates cortisol. Elevated cortisol further disrupts sleep. The cycle, once established over months, does not break through willpower or a white noise machine. The men who break it do so by addressing the cortisol elevation directly, through cardiovascular exercise (which is the most evidence-supported HPA axis regulator), through cognitive load reduction in the evening (which reduces the sympathetic activation that keeps evening cortisol elevated), and, in men whose hs-CRP indicates active systemic inflammation, through treating the underlying inflammatory driver.

This is the sleep conversation I have with patients. Not screens. Not melatonin. The system, and what is driving it.

The Honesty Scale

• Fixed wake time as a circadian anchor for sleep consolidation: Solid (1). The evidence base for sleep restriction therapy and consistent wake time in adults is among the strongest in behavioral sleep medicine. Multiple RCTs support this as the single most effective behavioral intervention.

• Bedroom temperature 65–68°F for deep sleep enhancement: Solid (1). The thermoregulation requirement for sleep onset and deep sleep maintenance is well-established physiology. The specific temperature range is supported by experimental data (Okamoto-Mizuno & Mizuno, 2012).

• Morning bright light for circadian alignment: Solid (1). The role of morning light exposure in setting the circadian phase through ipRGC-mediated signaling is established neuroscience. Outdoor light or a 10,000-lux light box within 60 minutes of waking is the standard clinical recommendation in circadian sleep medicine.

• Magnesium glycinate for sleep quality: Promising (2). Multiple small RCTs show improvement in subjective and objective sleep measures in adults, particularly those who are magnesium-deficient (common in men over 40). The evidence is not from large trials, and effect sizes vary.

• Ashwagandha (KSM-66) for HPA axis and cortisol: Early (3). The clinical trials are mostly small, short-duration, and conducted in explicitly high-stress populations. Effect sizes on cortisol biomarkers are real but modest. I do not prescribe adaptogens. I acknowledge the evidence is not zero.

• Blue light blocking glasses for sleep: Early (3). The evidence that blue light blocking at night meaningfully shifts melatonin timing and improves objective sleep is inconsistent. The intervention is low-risk and inexpensive; it is not the lever that moves sleep in the high-cortisol man.

• Alcohol for sleep: Unsupported (5) as a sleep aid. Alcohol accelerates sleep onset and then fragments deep sleep architecture through rebound arousal in the second half of the night. A man who drinks two glasses of wine to fall asleep is borrowing against his deep sleep quality. The wearable data on this is actually clear.

What the Other Voices Get Wrong

The Huberman approach to sleep deserves credit for its mechanistic rigor. His circadian light protocol, the NSDR (non-sleep deep rest) practice, and the temperature recommendations are grounded in real biology. The reason his audience complains about length and inaccessibility is not that the science is wrong. It is that the protocol is designed for a man who has unlimited time, no competing demands, and a willingness to restructure his entire daily architecture.

The 40–55 male executive who sleeps poorly is not going to take 90 minutes to watch a YouTube explanation of adenosine. He needs to know which three things matter most and why, stated by someone who has seen what sleep deprivation does downstream, not to neuronal plasticity, but to endothelial function and coronary artery disease risk. Huberman’s sleep content is excellent for the man it was designed for. It was not designed for the man I see in clinic.

Casey Means, whose Good Energy covered sleep as part of a metabolic health framework before her nomination was withdrawn in April 2026 (NYT, April 30, 2026), correctly identified the cortisol-sleep-metabolic axis. Her framing of poor sleep as a metabolic dysfunction, not a behavioral failure, is directionally correct. What is absent from her sleep content is the cardiac consequence, and the clinical specificity of what to do about a man whose evening cortisol is elevated. Means is not in clinical practice. She cannot say: “Here is what I measure and here is what I treat.” SDE can.

The sleep hygiene content on consumer health platforms, WebMD, Healthline, the entirety of the sleep app ecosystem, frames insomnia as a behavioral disorder and offers behavioral tips. For the 44-year-old with hs-CRP of 2.8 and a rising resting heart rate who stares at the ceiling thinking about vendor contracts, “no screens after 8pm” is not clinically adequate. It is the equivalent of telling a man with masked hypertension to relax. Technically true, operationally useless.

The cardiovascular consequence of chronic sleep disruption is not a metaphor. The Women’s Health Initiative and subsequent cohort studies have documented that short sleep duration (below six hours) is associated with 20–30% higher cardiovascular event rates, independent of other risk factors (Cappuccio et al., European Heart Journal, 2011). The mechanism includes elevated hs-CRP, increased platelet aggregation, impaired glucose metabolism (hence the elevated fasting insulin in my patient), and sustained sympathetic activation. None of the sleep hygiene content tells men this. SDE does.

Cardiologist’s Note

Cardiologist’s Note

The patient I think about most from this pattern is not the man who came to me exhausted. It is the man who came to me for palpitations. He was forty-six. He had been sleeping poorly for three years. He had adapted, he was functioning. What he noticed was occasional heart pounding at night that woke him. An irregular rhythm. We caught it in clinic: paroxysmal atrial fibrillation, triggered by the same sympathetic overdrive that had been keeping him awake.

Sleep apnea and chronic sympathetic dysregulation are both independent risk factors for atrial fibrillation. This is established cardiology, not speculation (Gami et al., Journal of the American College of Cardiology, 2007). The man who waves off his poor sleep as a work thing and his occasional palpitations as anxiety is describing a clinical presentation that warrants evaluation.

If you wake with a racing or irregular heartbeat and you have been sleeping poorly for months, that combination belongs in a cardiologist’s office, not a meditation app.

What to Do This Week

1. Set one fixed wake time and hold it for fourteen days, including weekends. This is not a lifestyle suggestion. It is the strongest single behavioral intervention in the clinical sleep medicine literature. A 6:15am wake time on Monday through Sunday, without exception, resets the circadian adenosine accumulation that makes falling asleep easy. The first four days are hard. After ten days, most men notice a meaningful change in sleep latency. Start here, before anything else.

2. Get outdoor light within thirty minutes of waking. Not a light box (though that works). Walk to the car without sunglasses. Stand on the back porch for five minutes. The intensity of outdoor light, 10,000–100,000 lux on a cloudy day versus 100–200 lux indoors, is the signal your suprachiasmatic nucleus uses to set the melatonin release timing for that night. This costs nothing.

3. Set your bedroom to 66–67°F before sleep. If your partner objects, a cooling mattress pad (ChiliPad, Eight Sleep, similar) achieves the same result for your side of the bed. Core body temperature decline is required for deep sleep onset. This is physiology, not comfort preference.

4. Do not have a large meal, significant alcohol, or intense cognitive work (email, financial decisions) in the ninety minutes before bed. Each of these maintains sympathetic activation past the point when your cortisol needs to be declining. The cortisol-evening-food connection is often the surprise: a large dinner drives insulin, which maintains metabolic activation, which keeps the autonomic nervous system engaged at the moment it should be quieting.

5. Consider magnesium glycinate at 300–400 mg, taken approximately forty-five minutes before sleep. This is the supplement with the most consistent clinical support for sleep quality in adults, and it is also a supplement with cardiac relevance: magnesium deficiency is associated with both sleep disruption and cardiac arrhythmia risk. If you are magnesium-replete, the effect is modest. If you are deficient, which affects 50–60% of Western men, it is more meaningful. A serum magnesium level (standard lab test, covered by most insurance) tells you your baseline.

6. Ask your physician to check a morning cortisol if you have been sleeping poorly for more than six months and behavioral changes have not resolved it. Specifically: “I have had persistent poor sleep with early morning awakening for six months. Could we check a morning cortisol, fasting insulin, and hs-CRP?” These three numbers together tell a story that no sleep app can tell.

7. If you have noticed any irregular heartbeat, palpitations, or heart pounding during the night or immediately upon waking, do not wait. See a cardiologist for an ECG and a Holter monitor before assuming these are anxiety. This is the clinical threshold for escalation, and it applies now, not at the next annual physical.

The Featured Snippet Block

How does stress affect sleep quality in men? Chronic stress degrades men’s sleep architecture primarily through elevated evening cortisol. Cortisol is a stimulant hormone that suppresses melatonin onset, raises the arousal threshold required to enter deep (N3) sleep, and frequently causes waking at 3–4 AM when cortisol begins its natural pre-dawn rise. High-achieving men often experience this as “racing thoughts at 3 AM”, which is physiology, not psychology. The three most effective interventions are: fixed wake time, bedroom temperature of 65–68°F, and morning outdoor light within 30 minutes of waking.

When to Call Your Cardiologist

Schedule an appointment this week, not at your next annual physical, if:

Your poor sleep has been accompanied by any of the following: a resting heart rate that has risen five or more beats per minute from your previous baseline; palpitations, skipped beats, or a pounding or racing heart that wakes you from sleep; new shortness of breath with exertion that did not previously cause it; chest discomfort that you have been attributing to stress or reflux.

Sleep disruption and cardiac arrhythmia share underlying mechanisms. The atrial fibrillation that paroxysmal presentation produces is frequently nocturnal, triggered by the same vagal and sympathetic oscillations that disrupt sleep. A Holter monitor (24–48 hour ECG) will detect arrhythmias that an office ECG misses.

Also schedule if your sleep has been consistently poor for more than six months and you have any of the following risk factors: family history of early cardiac disease; known elevated ApoB or Lp(a); previous history of hypertension; diabetes or pre-diabetes (fasting glucose above 100 mg/dL); or BMI above 30. In this risk profile, the sleep disruption is a cardiovascular signal, not an isolated sleep complaint, and it warrants evaluation.

The conversation to ask for: “I have had chronic poor sleep for more than six months, and I have [specific risk factor]. I would like to check a cortisol, hs-CRP, fasting insulin, and ApoB, and I would like to discuss whether ambulatory blood pressure monitoring is appropriate given my sleep pattern.” That is not a demanding question. It is a clinical conversation that most physicians will welcome from a prepared patient.

CTA Close

The man I described at the beginning of this article, forty-four years old, 4am on the ceiling, hs-CRP of 2.8, fasting insulin of 18.4, is not unusual. He is, in my practice, common. He is the man who has done everything the fitness and lifestyle world told him to do, and who is discovering that the cardiovascular system does not care about compliance. It cares about what is actually happening in the neuroendocrine and vascular environment his decisions create.

Six months after we addressed the cortisol pattern, adjusted his training timing to avoid high-intensity work within three hours of bed, corrected his magnesium deficiency, and had the twenty-minute conversation about what his hs-CRP was doing and why, his sleep had stabilized. He no longer saw 4am regularly. His hs-CRP was 1.1 mg/L. His Whoop showed an HRV trend pointing in the right direction.

He had not needed an elaborate protocol. He had needed a clinical diagnosis of what was actually driving the disruption, and a specific response to it.

The SDE Pattern Map, available through the Vascular Clock Starter Kit at stopdyingearly.com, is the five-instrument composite assessment that identifies cortisol dysregulation, HPA axis disruption, and cardiovascular stress load in men who present with exactly this profile. It is the diagnostic step between “my sleep is poor” and “here is what is driving it and what to do about it.”

The SDE Weekly Dispatch covers this category of question, the ones your physician did not have time to answer and the podcasts took three hours to not quite get to, every Tuesday morning.

EYANA. The one who speaks plainly.

Dr. Job Mogire, MD, FACP, FACC, is a board-certified cardiologist and internist in active clinical practice. He is the founder of Stop Dying Early. Nothing in this article constitutes individual medical advice. Discuss all supplement use and testing decisions with your physician.