On the 2nd of July, we celebrate Cycle to Work Day - an annual reminder that the daily commute can be more than simply getting from A to B. Thousands of people across the UK will swap their usual car, bus or train journey for a bike ride, motivated by the well-known benefits: improved fitness, lower travel costs and reduced carbon emissions.
But for many people, the most significant change may be what happens to their stress hormones before they've even reached their desk.
Cortisol, often referred to as the body's primary stress hormone, should peak within around 30 minutes of waking as part of a healthy daily rhythm. This natural surge helps us feel alert, focused and ready for the day ahead. However, emerging evidence suggests that age, chronic stress, disrupted sleep, and modern lifestyles can gradually alter this pattern, leaving many people feeling wired, tired, or both (1).
At the same time, sleep problems have become remarkably common. According to The Sleep Charity's 2024 Sleep Manifesto, nine in ten UK adults report experiencing sleep difficulties (2). Yet despite widespread complaints of poor sleep, afternoon energy crashes and persistent feelings of stress, cortisol is rarely discussed as a potential piece of the puzzle.
But most people in their 50s and 60s are not burning out in high-pressure startups or pulling all-night work sessions. Instead, they are carrying something much quieter: decades of accumulated stress, caring responsibilities, financial pressures, workplace demands, health concerns and a world that never truly switches off.
As a Clinical Nutritionist, I regularly speak with clients who describe the same thing: exhausted in the evening yet wide awake at night and running on adrenaline in the morning. What they're describing isn't just poor sleep or a busy life: it's a cortisol curve that's quietly stopped working in their favour.
Does any of this sound familiar? Here's what may actually be going on.
In this article, we'll explore what the cortisol curve is, the signs of high cortisol that many people have normalised, why afternoon fatigue isn't always about lunch, and how to lower cortisol naturally through evidence-informed lifestyle and nutritional strategies.
What is the cortisol curve, and why does it matter?
The cortisol curve describes the body's natural daily rhythm of cortisol production.
Cortisol is often called the "stress hormone", but that label only tells part of the story. It helps regulate energy production, blood sugar balance, immune function, inflammation, alertness and sleep-wake cycles. Without it, we wouldn't be able to get out of bed in the morning.
Cortisol works alongside two other key stress hormones, adrenaline and noradrenaline, which help mobilise energy and sharpen the body’s immediate stress response. This system is what people are referring to when they ask what are the 3 stress hormones.
Under normal circumstances, cortisol follows a predictable pattern. Levels begin rising during the final stages of sleep and reach their highest point shortly after waking. This early-morning increase is known as the Cortisol Awakening Response (CAR). Put simply, it is the body's built-in wake-up signal.
Around 30-45 minutes after waking, cortisol surges to help increase alertness, sharpen focus and prepare us for the day ahead. After this peak, cortisol should gradually decline throughout the day. By around 10-11pm, cortisol should be approaching its lowest point, helping create the conditions for restorative sleep (1).
The problem is that it evolved to deal with stressors that ended. A predator either caught you or didn't, a storm passed, or a conflict was resolved.
However, modern stress rarely works like that. Emails remain unanswered. Caring responsibilities continue overnight; financial worries linger for months; news alerts arrive around the clock. The body's stress systems were not designed for continuous activation, yet many people live in exactly that state (3).
Over time, the curve can flatten, be delayed, or invert, leading to symptoms that are often mistaken for simply "getting older" (1).
Signs of high cortisol: what does a disrupted curve feel like?
When people search for signs of high cortisol, they often expect dramatic symptoms, but the earliest clues are often subtle and easy to dismiss.
One of the most common signs is waking between 3am and 5am and finding it impossible to fall back asleep. The body feels tired, but the mind suddenly becomes active. Others notice a sense of tension before the day has even begun. It's a nervous energy rather than genuine vitality.
Many of the classic symptoms of high cortisol levels in the morning occur before anything stressful has happened, including jaw clenching on waking, a racing heart before you've opened a single email, or a sense of dread that arrives before the day has given you any reason for it. Mid-morning cravings can also offer clues. A strong desire for sugary snacks or salty foods often reflects the body's attempt to compensate for stress-related fluctuations in blood sugar and energy regulation.
As the day progresses, emotional resilience may begin to shrink. You find yourself reacting more quickly than you'd like or feeling overwhelmed by tasks that would normally feel manageable. Then comes the mental fog.
The challenge is that these signs often develop gradually. Because they arrive one small symptom at a time, many people simply assume they're part of ageing.
It's worth noting that this article is exploring functional cortisol dysregulation: the kind that develops gradually through lifestyle and stress accumulation. Clinical hypercortisolaemia, such as that seen in Cushing's syndrome, is a separate medical condition requiring diagnosis and treatment by a doctor. If you have concerns about your cortisol levels, always speak with your GP.
Why the afternoon fatigue? (it's not about lunch)
Afternoon fatigue is often blamed on a heavy lunch or a lack of willpower, but the afternoon slump frequently begins much earlier in the day.
A healthy cortisol curve naturally includes a small dip in alertness during the mid-afternoon - this is completely normal. Most people experience a brief reduction in energy between 2pm and 4pm. The difference lies in how that dip feels. A healthy dip is mild and temporary.
A cortisol-related crash feels different - people often describe it as hitting a wall. Energy suddenly disappears, motivation evaporates, and concentration becomes difficult. Some feel as though they could fall asleep at their desk. For many individuals, this afternoon fatigue is the downstream consequence of a dysregulated morning.
If cortisol surges too aggressively after waking, remains elevated throughout the morning, or is repeatedly triggered by high-stimulation environments such as rush-hour traffic, back-to-back meetings and constant screen exposure, the body can struggle to sustain stable energy production later in the day. By 2pm or 3pm, the system has effectively run out of momentum.
This is one reason active commuting is so interesting. Rather than beginning the day sitting in traffic while stress hormones rise unchecked, cycling introduces movement that helps the body process and utilise those hormones more effectively (4).
You may also hear people refer to this pattern as "adrenal fatigue". While this is not a recognised medical diagnosis, it often reflects what people mean when they say they feel burnt out: a blunted morning cortisol response followed by an exaggerated drop in energy later in the day.
Why can't I sleep? The evening cortisol problem
If you've ever found yourself asking, "Why can't I sleep?", you're far from alone. For many adults, bedtime has become one of the most frustrating parts of the day.
You're exhausted - you've been looking forward to bed for hours. Yet the moment your head hits the pillow, your brain suddenly becomes active. The shopping list appears, tomorrow's meeting replays and that awkward conversation from three years ago somehow returns. This is the classic "tired but wired" experience.
Ideally, cortisol should be approaching its lowest point between 10pm and 11pm. This decline acts as an important signal for melatonin production. As cortisol falls, melatonin rises, helping prepare the brain and body for sleep. Unfortunately, modern life often interferes with this handover. Bright screens continue stimulating the brain late into the evening, eating late keeps digestion and blood sugar active at a time when the body is trying to power down, work messages arrive after dinner, and unresolved mental load keeps the nervous system scanning for problems to solve.
The result is that cortisol remains elevated, and the body interprets this as a signal that vigilance is still required.
This is where movement becomes particularly relevant. Research consistently shows that physically active individuals tend to experience better sleep quality (5). Active commuters often report improvements in sleep, not because exercise is a magic solution, but because movement helps discharge the stress response in ways that sitting with adrenaline simply cannot.
Cycling to work creates a physiological transition between home and workplace. It allows the body to process stress hormones through muscular activity rather than storing them as unresolved tension. For people trapped in a cycle of poor sleep, elevated evening cortisol and morning exhaustion, this can be a surprisingly powerful intervention (4).
Why modern life bends the cortisol curve out of shape
The cortisol curve evolved in a very different world.
Today, three factors appear particularly relevant for adults in their 50s and 60s.
1. Chronic low-grade pressure
Many people are balancing careers while simultaneously supporting ageing parents, adult children or grandchildren. Financial uncertainty remains common. Work follows us home through smartphones and laptops.
2. Artificial light exposure
For most of human history, darkness signalled sleep. Today, bright screens continue stimulating the brain long after sunset, disrupting the hormonal signals that regulate sleep and recovery.
3. Accumulated stress learning
The hypothalamic-pituitary-adrenal (HPA) axis is highly adaptable. Over decades, repeated exposure to stress can teach the system to remain slightly elevated, even when no immediate threat exists (3).
Active commuting provides an interesting interruption to this cycle. Whether through cycling or brisk walking, movement creates a clear physiological signal that helps shift the body out of prolonged stress activation and back toward balance (4).
How to lower cortisol naturally: what actually works
When clients ask how to lower cortisol naturally, they're often hoping for a single solution.
Unfortunately, there isn't one.
The good news is that the nervous system responds strongly to consistent signals. Small daily actions can have a surprisingly powerful cumulative effect.
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Get outside within 30 minutes of waking
Morning light is one of the strongest signals for regulating the cortisol awakening response.
Even ten minutes outdoors can make a difference.
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Delay caffeine slightly
Many people reach for coffee immediately after waking. Allowing 60-90 minutes before your first caffeine intake gives your natural cortisol peak an opportunity to complete its work without interference.
This can support steadier energy later in the day.
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Use movement as a stress-discharge mechanism
Physical activity isn't simply about fitness. Walking, cycling, swimming or resistance training provide an outlet for stress hormones that were designed to fuel movement.
This is one reason active commuting can be so effective. It transforms otherwise passive stress exposure into productive physiological activity.
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Support nervous system downshifting
Many people need help transitioning from alertness to recovery.
Evidence-informed strategies include box breathing, mindfulness practices, brief cold exposure and carefully selected supplements. Magnesium, hops flower, Montmorency cherry and CBD are among the most evidence-informed options for evening nervous system support. We'll cover each of these in more detail below.
These approaches work by sending calming signals to the nervous system rather than forcing relaxation.
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Prioritise a protein-based breakfast
Protein helps stabilise blood sugar and reduce excessive demand on stress hormones.
Examples include:
- Greek yoghurt with nuts and berries
- Eggs with spinach and avocado
- Smoked salmon and wholegrain toast
- Tofu scramble with vegetables
- High-protein bean burgers with mixed salad
Stable blood sugar often translates into more stable energy and mood.
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Create an evening screen curfew
Blue light exposure in the final hours before bed suppresses melatonin production and reinforces wakefulness signals. Reducing screen exposure 60-90 minutes before sleep creates a clearer hormonal transition toward rest.
Cortisol-reducing supplements: what does the clinical evidence actually say?
Many people searching for cortisol supplements are hoping to find a single ingredient that fixes everything. Unfortunately, cortisol biology is more complex than that.
As a Nutritional Therapist, I view supplements as support rather than solutions. The foundations remain sleep, movement, light exposure, nutrition and stress management.
That said, several nutrients and botanicals have evidence supporting their role in different points along the cortisol curve.
| Supplement category | Ingredients | Point on the curve |
|---|---|---|
| Adaptogens | Ashwagandha, Rhodiola, Lion's mane, Holy basil | All-day HPA axis resilience |
| Calming amino acids | L-theanine, L-glycine | Morning spike to evening wind-down |
| Evening nervines | Valerian root, Passionflower, Hops flower* | Nervous system downshift |
| Natural melatonin supporters | Montmorency cherry, Magnesium | Sleep initiation |
| ECS-active compounds | CBD, Beta-caryophyllene* | Whole-curve regulation |
| Energy metabolism / neurocofactors | B vitamins | Morning and sustained daytime energy and stress processing |
*Hops flower contains beta-caryophyllene, a terpene with direct CB2 receptor activity, making it both an evening nervine and an ECS-active compound.
No single supplement addresses the entire curve. But used strategically across the day, this combination can support morning resilience, afternoon stability, evening wind-down and sleep initiation.
ECS-active compounds
CBD and beta-caryophyllene are particularly interesting because they interact with the endocannabinoid system (ECS), a network involved in stress regulation, mood and sleep.
Found throughout the brain, nervous system, immune tissue and adrenal glands, the ECS influences how the body activates and then dampens cortisol output, helping maintain overall physiological balance. Unlike other cortisol-reducing supplements, which each target a specific point on the curve, ECS-active compounds work upstream: balancing the whole body system itself rather than a single symptom of dysregulation.
For those seeking supplements for anxiety or stress support, ECS-active ingredients have become increasingly popular. CBD is the most widely researched, with a growing body of evidence for its role in stress resilience, sleep quality and nervous system tone. Beta-caryophyllene, a dietary cannabinoid and terpene found naturally in hops flower, black pepper and cloves, binds directly to CB2 receptors and contributes to additional ECS support – which is one reason why thoughtfully formulated products that combine these compounds may offer more than either ingredient alone.
Adaptogens
Adaptogens appear to support the body's ability to adapt to stress rather than directly stimulating or suppressing physiological processes.
Ashwagandha and rhodiola are among the most widely researched adrenal supplements. Other well-researched options include lion's mane mushroom, which has emerging evidence for supporting cognitive resilience under stress, and holy basil (tulsi), which has a long history of use in Ayurvedic medicine for HPA axis support and is gaining interest in functional nutrition practice.
Calming amino acids
L-theanine promotes alpha brainwave activity, often described as an alert-but-calm mental state. This makes it particularly useful for morning tension, commuter stress and workplace pressure.
L-glycine works differently; It supports sleep quality and the natural reduction in core body temperature associated with sleep onset, making it a useful evening ingredient.
B vitamins
B vitamins play a critical role in energy metabolism, neurotransmitter production and stress processing. Although not traditionally viewed as cortisol-reducing supplements, they support many of the systems involved in healthy stress resilience.
Evening nervines
Valerian root, passionflower and hops flowers have long histories of use in herbal medicine.
Valerian root has substantial evidence for sleep latency and nervous system calming. Passionflower acts on GABA pathways, helping reduce nervous system excitability and supporting individuals who struggle to switch off mentally. Hops flowers work synergistically and may provide additional calming effects.
These are often among the most useful adrenal fatigue supplements for individuals whose primary challenge is evening overactivation.
Natural melatonin supporters
Magnesium and Montmorency cherry support the transition from wakefulness to sleep.
Montmorency cherry contains naturally occurring melatonin, helping support the cortisol-to-melatonin handover that underpins healthy sleep initiation.
Final thoughts: How to lower cortisol naturally and sleep better
Many adults spend decades ignoring the signals their bodies are sending. The 3am waking. The afternoon crash. The morning tension. The feeling of being exhausted yet unable to switch off. These experiences are often dismissed as normal ageing, but they're frequently signs that the body's stress-response systems are asking for support.
The encouraging news is that the cortisol curve is responsive. Light, movement, nutrition, sleep habits and targeted supplementation can all influence the signals your nervous system receives.
Perhaps that is the hidden message behind Cycle to Work Day. A healthier commute isn't only about fitness. It may be one of the simplest ways to help your body remember the rhythm it was designed to follow.
If you'd like further support, explore the Provacan range, take our wellbeing quiz, or book a free, no strings attached consultation with one of our practitioners to discover a personalised approach to stress, sleep and recovery.
