The relationship between stress and sleep is one of the most consequential — and most reciprocal — in human health. Understanding the cycle is the first step to easing it.
Stress and sleep don't simply coexist — they shape one another, hour by hour, night by night.
At the centre of the stress response sits the hypothalamic-pituitary-adrenal (HPA) axis, a communication line between the brain and the adrenal glands that governs the release of cortisol. In a well-regulated body, cortisol follows a clear daily rhythm: it rises sharply in the morning to support wakefulness, then gradually tapers through the day, reaching its lowest point in the evening to allow the body to wind down.
Chronic stress disrupts that rhythm. Research on the HPA axis shows that under sustained psychological or physical pressure, evening cortisol can remain elevated instead of falling — directly interfering with the body's ability to settle into sleep. The result is a feedback loop: poor sleep elevates next-day cortisol, and elevated cortisol makes the following night's sleep harder to come by.
A simplified view of the bidirectional relationship documented in HPA-axis and insomnia research.
"No supplement category, including adaptogens, has been shown to produce equivalent effects to sleep normalisation in healthy adults."
— consistent finding across stress-physiology literatureThis is precisely why credible approaches to better sleep tend to work on both ends of the cycle at once: easing the nervous system's response to daily pressure, and supporting the body's natural transition into rest each evening. It also means there is no shortcut that bypasses the fundamentals — consistent sleep and wake times, adequate sleep duration of around seven to nine hours for most adults, and a calm wind-down routine remain the most strongly supported levers available.
Beyond how you feel the next morning, an extended stress–sleep cycle has measurable effects on the body.
The hippocampus, the brain region central to memory and emotional regulation, carries a high density of cortisol receptors — making it especially sensitive to prolonged elevation.
Poor sleep increases the body's reactivity to the next stressful event, and that heightened response in turn elevates cortisol further — compounding the cycle rather than resolving it.
Hyperarousal — sustained activity in the brain's waking-state signals — has been documented during both wakefulness and sleep in those with chronic difficulty settling at night.
Research also points to good news: in many cases, the effects of prolonged stress exposure are reversible once stress exposure and sleep quality are addressed together.
MONDAYSUNDAY's botanical drops are built around the two pressure points of the stress–sleep cycle: the calm needed through the day, and the wind-down needed before bed.
A terpene-led, plant-based formula taken through the day to support a settled nervous system and steady focus, without affecting daytime alertness.
Total potency 9,840mg per serve. Alcohol-free, vegan, in an artisanal spring-water base.
A complementary terpene blend paired with traditional evening botanicals, taken as part of a wind-down ritual before bed.
Alcohol-free, vegan and plant-based, formulated with input from healthcare practitioners.
Terpenes are the natural aromatic compounds that give plants their character. Here is what's used across the MONDAYSUNDAY range, and where each one is found in nature.
| Compound | Found in | Used in |
|---|---|---|
| Limonene | Citrus peel, juniper, peppermint | Calm & Sleep |
| Beta-Caryophyllene | Black pepper, cloves, rosemary | Calm & Sleep |
| Myrcene | Hops, mango, lemongrass, thyme | Sleep |
| Linalool | Lavender, coriander, sweet basil | Sleep |
| L-Theanine | Green & black tea leaves | Calm |
Terpene and ingredient notes above describe general compound properties and aroma character — they are not claims of therapeutic effect.
References to traditional use reflect the history of these botanicals in Western herbal medicine. They are not proof of clinical efficacy, and linked research relates to individual ingredients, not to MONDAYSUNDAY products as a whole.
Botanical drops formulated to meet the stress–sleep cycle at both ends — your daily calm, and your nightly rest.
Visit MONDAYSUNDAYThis article draws on peer-reviewed research into the HPA axis and sleep, alongside the ingredient evidence published in MONDAYSUNDAY's own Glossary + Evidence page.