DHEA and Sleep: What the Research Actually Shows

DHEA and Sleep: What the Research Actually Shows

Dehydroepiandrosterone — better known as DHEA — is produced primarily by the adrenal glands and serves as a precursor to both estrogen and testosterone. In the 1990s, researchers began noticing something striking: the steep, age-related decline in DHEA correlated not just with hormonal changes, but with deteriorating sleep quality. DHEA peaks in your mid-20s and then falls at roughly 2–3% per year, so that by age 70 most adults have circulating DHEA-S concentrations that are 80–90% lower than young-adult levels. Since then, a growing body of literature has explored the relationship between DHEA, sleep architecture, cortisol regulation, and longevity. What follows is a plain-language review of where the evidence stands.

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How DHEA Interacts With Sleep Architecture

Sleep is not a uniform state. It cycles through light NREM sleep, slow-wave sleep (SWS), and REM sleep — each stage serving distinct restorative functions. DHEA appears to be most relevant to REM sleep, the stage associated with memory consolidation, emotional processing, and hormonal restoration.

A landmark study by Friess and colleagues published in Sleep (1995; PMID: 7701190) administered 500 mg oral DHEA to young men and measured polysomnographic sleep outcomes. REM sleep increased significantly compared to placebo, and participants reported improved mood upon waking. While 500 mg is a pharmacological rather than physiological dose, the finding established a plausible mechanistic link: DHEA and its neuroactive metabolites — including 7α-hydroxy-DHEA and androstenediol — appear to modulate GABAergic and sigma-1 receptor activity in the brain, both of which are involved in REM regulation. The sigma-1 receptor connection is particularly relevant because sigma-1 agonism is associated with neuroprotection and the suppression of excessive fear-memory consolidation, which may partly explain why low DHEA correlates with heightened nighttime anxiety in some individuals.

More recent work has examined naturally occurring DHEA-S (the sulfated, storage form) and sleep quality in older adults. A cross-sectional analysis found that lower DHEA-S levels were independently associated with shorter sleep duration and more fragmented sleep in adults over 65 (Enomoto et al., Journal of Clinical Endocrinology & Metabolism 2008; PMID: 18073310). Importantly, this association held even after adjusting for cortisol — suggesting DHEA's influence on sleep isn't simply a mirror image of the better-known cortisol-disrupts-sleep pathway.

A secondary analysis from the Osteoporotic Fractures in Men (MrOS) Sleep Study further characterized these associations, finding that men in the lowest tertile of DHEA-S had significantly shorter objectively measured sleep duration and higher rates of sleep-disordered breathing compared to age-matched men in the highest tertile (Cauley et al., Journal of Clinical Sleep Medicine 2010; PMID: 20374878). Effect sizes were modest but consistent — roughly 20–25 fewer minutes of total sleep time per night across the lowest vs. highest DHEA-S quartile — suggesting that DHEA status is one of several contributing variables rather than the single driver of age-related sleep deterioration.

The adrenal glands produce both DHEA and cortisol, and the two hormones exist in a kind of dynamic balance. When chronic stress drives cortisol chronically high, DHEA production can be suppressed — worsening the cortisol-to-DHEA ratio and amplifying sleep disruption. Supporting adrenal function through lifestyle and targeted nutrition is therefore relevant not just to daytime energy, but to nighttime recovery as well.

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Glycine for Sleep: A Complementary Amino Acid Worth Understanding

Before going deeper on DHEA supplementation, it's worth addressing glycine — an amino acid that frequently appears alongside DHEA in discussions of sleep optimization, and for good reason.

Glycine is an inhibitory neurotransmitter that acts at glycine receptors in the spinal cord and brainstem. When taken orally before bed (typically 3 g), it has been shown to lower core body temperature — a well-established trigger for sleep onset — by promoting peripheral vasodilation (Kawai et al., Sleep and Biological Rhythms 2015; doi.org/10.1111/sbr.12107). A randomized crossover trial by Inagawa and colleagues (Sleep and Biological Rhythms 2006; PMID: 17240190) found that 3 g glycine before bed significantly improved subjective sleep quality, reduced daytime sleepiness, and improved psychomotor performance the following morning in adults who reported poor sleep.

A separate placebo-controlled trial by Bannai and colleagues (Frontiers in Neurology 2012; PMID: 22529837) extended those findings: 3 g of glycine taken 1 hour before bedtime reduced fatigue and sleepiness ratings the following day by statistically significant margins, with participants showing improved performance on a sustained attention task. Importantly, the effect appeared within the first night of use, suggesting an acute rather than cumulative mechanism. The core body temperature reduction — measured as a drop of approximately 0.3–0.5°C at sleep onset — is thought to be the primary driver, as thermoregulatory cooling is one of the body's most reliable signals for transitioning from wake to sleep.

Glycine and DHEA are not redundant — they appear to improve sleep through entirely different mechanisms. Glycine works acutely on thermoregulation and inhibitory neurotransmission, while DHEA appears to influence sleep architecture over a longer arc, particularly REM sleep and stress-related hormonal tone. Used together in an evidence-informed formula, they may be complementary rather than interchangeable.

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Overcoming Nighttime Anxiety: The Cortisol-DHEA Connection

Many people find that falling asleep is not the issue — it's what happens in the hours before bed. Racing thoughts, an elevated sense of threat, or a low-grade dread that something is wrong are not uncommon, and they have a real physiological substrate. Elevated evening cortisol — sometimes driven by HPA axis dysregulation — is one of the most consistent findings in people with insomnia characterized by anxious rumination.

This is where the cortisol-to-DHEA ratio becomes clinically interesting. DHEA acts as a functional counter-regulator to cortisol. Animal and human studies suggest that DHEA exerts anti-glucocorticoid effects at the receptor level, potentially blunting cortisol's excitatory signaling in limbic regions of the brain involved in fear and threat detection (Hechter et al., Medical Hypotheses 1997; PMID: 9247903). When DHEA levels are low relative to cortisol — a pattern that worsens with age, chronic stress, and poor sleep itself — the nervous system may remain in a more vigilant, threat-ready state even at night. Some researchers have specifically characterized this as a "cortisol escape" from DHEA counterregulation: in younger adults with healthy DHEA-S levels, the late-evening cortisol surge that normally precedes early-morning awakening is partly buffered; as DHEA falls, that buffer weakens.

If nighttime anxiety is persistent, it's worth speaking with a healthcare provider to rule out underlying contributors like elevated cortisol, adrenal dysregulation, or hormonal imbalances that a standard lab panel can capture. Tracking strategies around lowering fasting glucose without medication alongside cortisol markers can also help paint a fuller metabolic picture, since blood sugar dysregulation and cortisol dysregulation are tightly linked at the adrenal level.

Practical, evidence-supported approaches to managing nighttime anxiety include:

1. Set a consistent wind-down window — 45–60 minutes of dim light and low stimulation before bed lowers evening cortisol more reliably than single interventions alone.
2. Diaphragmatic breathing — A 4-7-8 breath pattern (inhale 4 sec, hold 7, exhale 8) activates the vagus nerve and measurably lowers heart rate variability markers of threat response.
3. Address the cortisol-DHEA ratio — Through adaptogenic herbs, lifestyle, and where appropriate, supplementation reviewed with a clinician.
4. Consider glycine — 3 g taken 30–60 minutes before bed may reduce sleep latency and improve morning alertness without dependency risk.
5. Limit evening alcohol — Even moderate intake suppresses REM sleep and elevates overnight cortisol, compounding the problem.

For individuals who carry significant anxiety about sleep itself — a phenomenon sometimes called sleep-related hyperarousal — cognitive behavioral therapy for insomnia (CBT-I) remains the most evidence-supported first-line intervention, with effect sizes exceeding those of most pharmacological treatments in head-to-head trials. Addressing the physiological hormonal substrate (DHEA, cortisol, thyroid) complements but does not replace behavioral approaches.

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Chromium for Sleep: What Does the Evidence Say?

Chromium is an essential trace mineral most recognized for its role in insulin signaling and blood glucose regulation. Its connection to sleep is less direct — but the link exists through glycemic control. Blood sugar instability in the evening, particularly reactive hypoglycemia in the early morning hours (2–4 AM), is a well-documented driver of nighttime waking. Cortisol and adrenaline are released in response to low glucose, pulling the sleeper out of deep sleep.

Chromium picolinate at doses of 200–1000 mcg/day has been studied for its effect on insulin sensitivity (Anderson et al., Diabetes 1997; PMID: 9356027). By improving cellular glucose uptake and reducing post-meal glucose excursions, chromium may indirectly stabilize overnight blood sugar — potentially reducing cortisol-mediated nocturnal awakenings in people whose sleep is disrupted by glycemic instability. The mechanism involves chromium's role in potentiating insulin receptor tyrosine kinase activity, which amplifies the signal for glucose transporter (GLUT4) translocation into cell membranes — essentially making cells more responsive to the same amount of insulin.

This is not a direct sleep supplement in the same way glycine or DHEA are — but for individuals whose wearable data or lab results show poor glucose regulation, chromium represents a mechanistically coherent addition to consider. If you're exploring how diet affects these pathways, the evidence on how diet can change fasting glucose provides a useful starting point for understanding where chromium fits in a broader metabolic strategy.

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Iodine for Sleep: Thyroid Function and Sleep Quality

Iodine's connection to sleep is largely mediated through thyroid function. Iodine is the essential raw material for thyroid hormone synthesis — both T4 and T3 require it. Specifically, the thyroid incorporates four iodine atoms into T4 and three into T3, and without adequate dietary iodine, this synthesis rate falls. Thyroid hormones have wide-ranging effects on sleep: hypothyroid individuals frequently report excessive sleepiness, poor sleep quality, and reduced slow-wave sleep, while hyperthyroid states are associated with insomnia and fragmented sleep architecture. The mechanism runs through basal metabolic rate, core body temperature regulation, and the modulation of adenosine — the sleep-pressure molecule that accumulates during waking hours.

Deficiency-driven hypothyroidism is relatively uncommon in iodine-replete regions, but borderline-low iodine intake is more prevalent than often recognized — particularly in people who have cut out iodized salt or dairy. If sleep quality is declining alongside fatigue, cold sensitivity, or cognitive slowing, thyroid function testing (TSH, free T3, free T4) is worth discussing with a clinician.

It's important to note that iodine supplementation beyond RDA levels (150 mcg/day for adults) is not appropriate without clinical guidance, particularly in individuals with autoimmune thyroid conditions such as Hashimoto's thyroiditis, where excess iodine can transiently worsen inflammation. The relationship between iodine and sleep is therefore primarily about ensuring adequacy, not about high-dose supplementation as a sleep hack.

For a broader look at supplement strategies relevant to metabolic health — which underpins both sleep quality and hormonal balance — see what supplements affect fasting glucose and how those signals intersect with overnight cortisol dynamics. Similarly, if you're using wearable data to track recovery, understanding whether exercise can lower fasting insulin adds an important lifestyle lens to the picture.

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What This Means for Your Formula

At Ones, every formula is built by analyzing the individual's lab results, wearable data, and health history — not by defaulting to a standard sleep stack. The AI health practitioner identifies patterns like elevated cortisol-to-DHEA ratios, poor glucose regulation, or thyroid markers that sit within range but at the edges — and builds a formula calibrated to those specific signals.

For individuals whose data suggests adrenal dysregulation or HPA axis stress, the Adrenal Support System Blend in the Ones catalog is specifically formulated to address cortisol-DHEA imbalance. It combines adaptogenic and adrenal-supporting nutrients at clinically relevant doses — not generic amounts added to fill a label.

Rhodiola Rosea is another ingredient that appears in Ones formulas where stress-related sleep disruption is the primary finding. Rhodiola has been studied for its ability to reduce cortisol output and improve stress resilience: a placebo-controlled trial in 80 subjects found significant reductions in cortisol response and burnout scores after four weeks of 400 mg/day standardized extract (Olsson et al., Planta Medica 2009; PMID: 19016404). Rhodiola's primary active compounds — rosavins and salidroside — appear to act on the stress-response enzyme 3',5'-AMP phosphodiesterase, blunting the hormonal cascade that keeps cortisol elevated into the evening.

For individuals where glycemic instability appears to be a sleep disruptor — identifiable from continuous glucose monitor data or fasting insulin results — the Ones formula may include chromium at clinically relevant doses alongside dietary guidance. The goal is a formula that targets your specific bottleneck — whether that's the cortisol-DHEA ratio, glycemic instability, thyroid adequacy, or something else entirely identified from your actual data.

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Key Takeaways

• DHEA and sleep are meaningfully connected: lower DHEA-S levels are associated with shorter, more fragmented sleep — particularly reductions in REM sleep — independent of cortisol levels, with effect sizes of roughly 20–25 fewer minutes of total sleep time per night in the lowest vs. highest quartile.
• The cortisol-to-DHEA ratio matters: chronic stress suppresses DHEA and elevates cortisol, creating a hormonal environment that weakens the buffer against early-morning cortisol surges and makes restful, uninterrupted sleep harder to achieve.
• Glycine (3 g before bed) is one of the most evidence-supported acute sleep aids, improving sleep onset, quality, and next-day performance through thermoregulatory cooling (approximately 0.3–0.5°C drop) and inhibitory neurotransmitter pathways.
• Chromium and iodine affect sleep indirectly — through glycemic stability and thyroid function, respectively — and are most relevant when lab or wearable data suggest those systems are underperforming.
• Nighttime anxiety has a physiological substrate: supporting the HPA axis through consistent wind-down routines, adaptogenic herbs like Rhodiola, and targeted nutrients is a legitimate, evidence-based complement to behavioral approaches like CBT-I.
• Personalized data drives better decisions: a formula built from your actual cortisol patterns, glucose variability, and hormonal markers will outperform a generic sleep supplement stack every time.

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This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any new supplement, particularly hormone-related compounds like DHEA.