Stressed, Wired or Run Down? What Stress Does to Sleep, Energy and Your Body

In 30 seconds

• Stress can leave you tired and over-alert at the same time. Those feelings are not contradictory.
• Cortisol is an essential hormone with a normal daily rhythm. The goal is not simply to make cortisol as low as possible.
• “Adrenal fatigue” is not a recognised medical diagnosis. Real adrenal insufficiency exists, but it is a different condition that requires proper clinical assessment and blood testing.
• Sleep, caffeine, food intake, exercise, anxiety, medicines and underlying health problems can all contribute. A supplement cannot tell you which one is responsible.
• Research on magnesium, ashwagandha, rhodiola, chamomile and L-theanine is interesting but mixed. Foundations first; ingredients second. HTMA can add mineral-nutrition context where relevant, but it cannot diagnose stress, cortisol problems or adrenal disease.

How can you be wired and tired at the same time?

It sounds like a contradiction.

If you are tired, surely your body should simply go to sleep.

But fatigue and alertness are controlled by more than one system.

You can have a strong need for rest while your brain and nervous system are still responding as though something needs your attention.

That can feel like:

• A racing mind in an exhausted body
• Feeling sleepy during the afternoon but alert when you get into bed
• Being physically tired but unable to relax
• Feeling irritable or easily startled
• Needing caffeine to function but then struggling to sleep
• Waking during the night and immediately beginning to think
• Feeling as though you are permanently “on”

“Wired but tired” is a useful description.

It is not a diagnosis.

What actually happens when you are stressed?

Stress is not automatically harmful.

Your stress response exists because sometimes you genuinely need to react quickly.

Imagine a car suddenly pulling out in front of you.

Your body does not hold a committee meeting.

It rapidly changes heart rate, breathing, attention and energy availability so you can respond.

Hormones including adrenaline and cortisol participate in that response.

In the short term, this can be extremely useful.

Problems become more likely when the pressures keep arriving and the body gets too little opportunity to return to a calmer state.

The NHS lists stress-related changes that can include:

• Muscle tension or pain
• Headaches or dizziness
• Stomach problems
• A faster heartbeat
• Difficulty concentrating
• Feeling overwhelmed
• Constant worry
• Irritability
• Sleeping too much or too little
• Eating more or less than usual

This helps explain why somebody may initially visit a health website because of poor sleep, digestive symptoms, fatigue or tension without immediately thinking:

“Perhaps stress is part of the picture.”

Cortisol: useful hormone, not the enemy

Cortisol has acquired a strange reputation on social media.

It is often presented as though it were a toxin that needs to be “flushed”, “blocked” or driven down.

That is not what cortisol is.

Cortisol is an essential hormone produced by the adrenal glands.

Among its normal jobs, it helps regulate:

• Energy availability
• Blood glucose
• Metabolism
• Blood pressure
• Inflammatory responses
• The body's response to physical and psychological demands

Cortisol is supposed to change during the day

A healthy cortisol level is not one flat number.

Cortisol normally follows a daily rhythm.

A large part of normal cortisol secretion occurs around morning awakening.

Researchers describe a cortisol awakening response: cortisol typically rises rapidly during roughly the first 30 to 45 minutes after waking.

That morning rise is thought to help prepare the body for the demands of the coming day.

Cortisol normally becomes lower later in the day and overnight.

Why one cortisol number can be misleading

Cortisol changes with time of day, sleep, illness, medicines and many other factors.

A random cortisol measurement is therefore not a simple score of how stressed somebody is.

And even when a study finds that an intervention changes cortisol, that does not automatically mean the person feels less stressed.

We will come back to that distinction when we look at ashwagandha research.

Is “adrenal fatigue” real?

This is an important question because somebody who feels exhausted, stressed and unable to recover may eventually encounter the phrase:

“adrenal fatigue”.

The theory suggests that prolonged stress eventually exhausts the adrenal glands so that they cannot keep producing enough stress hormones.

It is an appealing explanation.

But the Endocrine Society states that “adrenal fatigue” is not a recognised medical condition and there is not scientific evidence that ordinary chronic stress causes the adrenal glands to burn out in this way.

There is also no validated diagnostic test for “adrenal fatigue”.

This does not mean that a person who feels exhausted is imagining their symptoms.

It means we should not use an unsupported label when the same symptoms can occur for many different reasons.

Real adrenal insufficiency is different

Adrenal insufficiency is a genuine medical condition.

It occurs when the body does not produce enough glucocorticoid hormones such as cortisol because of disease affecting the adrenal glands, pituitary/hypothalamic system, or because of certain medicines or withdrawal from prolonged glucocorticoid treatment.

NICE advises clinicians to consider adrenal insufficiency when there is no better explanation for persistent features such as:

• Unexplained weight loss
• Salt craving
• Nausea or vomiting
• Poor appetite
• Diarrhoea
• Dizziness or light-headedness on standing
• Lethargy
• Muscle weakness
• Low blood pressure
• Unexplained increased skin pigmentation in primary adrenal insufficiency

That requires proper clinical assessment.

It should not be confused with feeling run down after a stressful month.

The stress-sleep loop can keep itself going

Stress can make sleep difficult.

Poor sleep can then make normal life feel more stressful.

That creates a loop.

The NHS lists stress, anxiety and depression among common causes of insomnia.

Poor sleep can then leave you:

• Tired during the day
• Irritable
• Less able to concentrate
• Less able to cope with ordinary tasks

The bedtime paradox

During a busy day, distraction may keep worries in the background.

Then the room becomes quiet.

Suddenly the brain has space to replay:

• Tomorrow's problems
• Today's mistakes
• Money worries
• Work problems
• Health concerns
• Family issues

The body may be exhausted while the mind is still treating those thoughts as unfinished business.

Then caffeine enters the loop

A poor night often leads to more coffee, tea, energy drinks or pre-workout stimulants the next day.

That may temporarily improve alertness.

But caffeine taken too late can make the following night's sleep harder.

Then the next morning needs even more caffeine.

The solution is not that everybody must abandon coffee. It is to recognise when caffeine has stopped being an enjoyable drink and started becoming part of the sleep-fatigue cycle.

Food can make the day easier — or harder

Stress changes eating differently in different people.

Some people lose their appetite.

Others snack constantly.

Some become so busy that breakfast disappears, lunch becomes coffee and dinner is the first proper meal of the day.

That is not a very stable foundation for somebody already feeling run down.

Start with enough food

Your body needs energy and nutrients whether or not you feel stressed.

If you are regularly under-eating, skipping meals or relying mainly on snack foods and caffeine, improving the overall pattern may matter more than finding the perfect “anti-stress” supplement.

A useful meal pattern usually gives attention to:

• Protein
• Vegetables and fruit
• Fibre-rich carbohydrates
• Healthy fats
• Adequate fluid
• A varied intake of vitamins and minerals

Do not turn every afternoon slump into “blood sugar problems”

Feeling tired, shaky or irritable between meals can have several explanations.

Symptoms alone do not diagnose hypoglycaemia, insulin resistance or diabetes.

But if long gaps without food reliably leave you feeling much worse, a more regular eating pattern may be a sensible low-risk experiment while more persistent or unusual symptoms are properly assessed.

What about magnesium?

Magnesium is involved in hundreds of biochemical processes and is important for normal nerve and muscle function.

That makes it an obvious ingredient in products marketed for:

• Stress
• Relaxation
• Sleep
• Muscle tension

But being biologically important does not mean additional magnesium automatically improves stress or sleep in everybody.

A systematic review examining magnesium and sleep found that observational studies often linked better magnesium status with better sleep, while randomised trials gave inconsistent results.

More recent evidence is still nuanced.

A 2025 randomised placebo-controlled trial studied 155 adults who reported poor sleep.

Magnesium bisglycinate produced a statistically greater improvement in insomnia scores than placebo after four weeks.

But the effect was small.

Exploratory results suggested that people with lower baseline magnesium intake might have benefited more.

That makes biological sense, but it needs further research.

Food first still makes sense

Magnesium-rich foods include:

• Nuts
• Seeds
• Beans
• Lentils
• Wholegrains
• Green leafy vegetables

What does the evidence say about popular stress and sleep ingredients?

This is an area where traditional use, promising research and marketing often become mixed together.

It helps to separate them.

Some plant ingredients are described as adaptogens — a term generally used for substances proposed to help the body cope with physical or psychological stress.

That does not mean every adaptogen has the same evidence or that it “normalises cortisol” in every person.

Ashwagandha: probably the strongest stress evidence of this group

Ashwagandha — Withania somnifera — has accumulated a meaningful number of human trials.

A 2024 systematic review and meta-analysis included nine randomised controlled trials involving 558 participants.

It reported improvements in perceived stress, anxiety scores and cortisol compared with placebo.

That sounds straightforward.

But a later meta-analysis published in 2025 found something particularly interesting.

Across the studies it analysed, ashwagandha produced a statistically significant reduction in cortisol.

Yet the pooled reduction in perceived stress was not statistically significant.

In February 2026, another systematic review and dose-response meta-analysis pooled 22 studies.

It again found promising effects for stress, anxiety and depressive symptoms.

But the authors stressed that better-quality trials are still needed because the existing studies differ considerably in formulation, dose, duration and methodology.

Ashwagandha therefore has promising human evidence.

It should not be presented as a guaranteed treatment, and long-term safety, ideal dosing and suitability for different groups still need clearer evidence.

Rhodiola rosea: perhaps more interesting when fatigue is part of the picture

Rhodiola rosea has traditionally been associated with resilience to physical and mental stress.

One often-cited placebo-controlled trial involved 60 people with stress-related fatigue.

After 28 days, the rhodiola group showed advantages over placebo on some measures of fatigue and attention.

That is encouraging.

But it is one relatively small study from 2009.

A broader systematic review published in 2026 examined 24 trials of ashwagandha and rhodiola.

Nineteen involved ashwagandha and only five involved rhodiola.

Across the overall evidence base, the review reported potential benefits for stress resilience, mood, sleep and physical performance.

But it also highlighted the short duration, small samples and substantial differences between studies.

Chamomile: old remedy, some modern sleep evidence

Chamomile has been used traditionally as a calming evening drink for generations.

Modern evidence is not enormous, but it is not nonexistent either.

A 2024 systematic review and meta-analysis included ten clinical studies involving 772 participants.

Overall sleep-quality scores improved.

Some studies also suggested improvements in falling asleep or staying asleep.

But chamomile did not consistently improve:

• Total sleep duration
• Sleep efficiency
• Daytime functioning or fatigue

The studies were also quite different from one another.

So a cup of chamomile tea can be a pleasant part of an evening wind-down routine.

It should not be promoted as though it were a proven treatment for chronic insomnia or an anxiety disorder.

L-theanine: the evidence became more interesting — and more complicated

L-theanine is an amino acid naturally present in tea.

A 2025 systematic review and meta-analysis included 19 articles involving 897 participants.

It found modest improvements in several subjective sleep outcomes, including overall sleep quality and perceived sleep onset.

The authors also pointed out that more research on pure L-theanine, dose and duration was needed.

Then, in July 2026, a larger meta-analysis examined 31 randomised trials involving 1,168 participants.

Its findings were more cautious.

L-theanine showed a fairly clear short-term effect on some measures of attention.

But the apparent reduction in acute stress was modest and was strongly influenced by studies judged to have a high risk of bias.

Effects on anxiety were inconsistent.

There was no significant overall effect on fatigue.

What about reishi mushroom?

Reishi — Ganoderma lucidum — has a long history of traditional use and is found in many modern wellness formulations.

There is some human research involving fatigue and wellbeing.

For example, an older 2005 placebo-controlled trial in 132 people diagnosed with neurasthenia reported improvements in some fatigue and wellbeing measures with a reishi polysaccharide extract.

But that is an old study in a specific patient group, using a particular extract.

It does not establish reishi as a routine treatment for modern everyday stress, anxiety or insomnia.

Reishi remains biologically and traditionally interesting. The direct human evidence for ordinary stress and sleep support is still much thinner than marketing sometimes suggests.

What we know — and what we do not

What we know

• Stress can affect sleep, concentration, appetite, mood, digestion, muscle tension and energy.
• Poor sleep can make it harder to cope with stress the following day.
• Cortisol is an essential hormone with a normal daily rhythm.
• A healthy cortisol pattern is not the same thing as simply having “low cortisol”.
• “Adrenal fatigue” is not a recognised medical diagnosis.
• Real adrenal insufficiency is a genuine medical condition and should be investigated clinically.
• Ashwagandha has a growing body of human evidence for stress-related outcomes, although results and study quality vary.
• Rhodiola has some promising evidence around stress-related fatigue.
• Chamomile, L-theanine and magnesium have some supportive sleep-related evidence, but the effects are not universal or dramatic.

What we cannot tell from feeling “wired and tired”

The symptoms alone cannot tell us:

• That cortisol is high
• That cortisol is low
• That the adrenal glands are “fatigued”
• That magnesium is deficient
• That blood sugar is abnormal
• That a particular supplement is needed
• That stress is the only cause

Would testing add useful information?

Sometimes.

But the useful test depends on the question.

Somebody who has been exhausted for months may need a very different investigation from somebody who has slept badly during one stressful week.

Persistent fatigue can overlap with many conditions.

Depending on symptoms, medicines and medical history, a clinician may consider investigations relating to:

• Anaemia or iron status
• Vitamin B12 or folate
• Thyroid function
• Blood glucose
• Kidney or liver function
• Other nutritional or medical causes where clinically indicated

Loud snoring, choking or gasping during sleep can point towards sleep apnoea rather than a supplement problem.

What if there is a genuine question about adrenal insufficiency?

This is where proper cortisol testing has a legitimate medical role.

NICE recommends an 8 am to 9 am serum cortisol test when adrenal insufficiency is clinically suspected.

NICE specifically notes that random cortisol testing at other times should not be used for this purpose because cortisol changes through the day.

Salivary cortisol and cortisone testing for initial diagnosis is still considered an emerging area requiring further research.

Where can HTMA fit?

Stress, fatigue and sleep problems sometimes lead people to ask whether mineral nutrition might be part of the wider picture.

Hair Tissue Mineral Analysis can provide nutritional context by measuring selected minerals and elements in a sample of newly grown hair.

The report may show:

• Minerals appearing relatively higher or lower in the hair sample compared with the laboratory reference range
• Patterns across several minerals
• Relationships and ratios between minerals
• Changes in mineral patterns when a later sample is compared with the first

Depending on the wider nutritional question, this may include minerals such as magnesium, calcium, sodium and potassium.

But the boundary is particularly important on a stress page.

It also does not diagnose a whole-body mineral deficiency or excess simply because a mineral appears relatively low or high in the hair sample.

Hair and blood answer different questions.

Where persistent fatigue, anaemia, thyroid disease, blood-glucose problems or adrenal insufficiency are suspected, appropriate clinical assessment and blood testing take priority.

HTMA may instead be useful when the question is broader:

“Could my diet, supplement use and longer-term mineral pattern add useful nutritional context to how I am feeling?”

Learn More About HTMA

What is new right now? — August 2026

The interesting change is not the arrival of one miracle stress supplement. It is that newer reviews are helping us separate promising signals from marketing shortcuts.

We will update this page when better trials, systematic reviews or clinical guidance materially change what we know about stress, sleep, fatigue, cortisol or the ingredients discussed here.

What can you do now?

1. Identify what is actually keeping you “on”

Stress management becomes vague when everything is labelled “stress”.

Ask what is actually happening:

• Too much work?
• Money worries?
• Relationship problems?
• Health anxiety?
• Care responsibilities?
• Too little recovery time?
• A mind that continues problem-solving in bed?

You may not be able to remove the entire problem.

But reducing one repeated source of pressure can be more useful than adding five supplements.

2. Protect the sleep-wake rhythm

Try to keep waking and sleeping times reasonably consistent.

Give the brain a wind-down period rather than expecting it to move directly from work, messages and stimulation into sleep.

3. Look honestly at caffeine

Ask what time your last caffeinated drink, energy drink or pre-workout occurs.

The NHS advises avoiding tea or coffee for at least six hours before bed when insomnia is a problem.

4. Eat enough and eat reasonably well

Build the diet around actual food before trying to construct an “anti-cortisol supplement stack”.

Regular meals, adequate protein, fibre-rich foods, vegetables, fruit, healthy fats and sufficient fluids give the body a much better nutritional foundation.

5. Move — but do not use exercise as another punishment

Regular physical activity can support wellbeing and sleep.

But somebody who is already exhausted does not necessarily need to add seven punishing training sessions a week.

Exercise should be part of recovery, not another source of unsustainable pressure.

6. Give the nervous system an actual off-ramp

That might include:

• Slow breathing
• Meditation
• A quiet walk
• Writing worries down before bed
• Relaxation exercises
• Talking to somebody you trust
• CBT or psychological support where appropriate

The method matters less than whether it genuinely helps you move from constant stimulation towards recovery.

7. If you use supplements, ask what problem each one is supposed to solve

Magnesium, ashwagandha, rhodiola, chamomile and L-theanine are not interchangeable.

Avoid building a complicated stack simply because every ingredient has the word “stress” somewhere on its label.

When professional assessment matters

Stress is common.

But “I'm stressed” should not become an explanation for every persistent symptom.

Consider appropriate medical assessment when:

• Fatigue persists despite adequate opportunity for sleep and recovery
• Sleep problems have continued for months or significantly affect daily life
• You have persistent palpitations or unexplained breathlessness
• You are losing weight without intending to
• You repeatedly feel faint or very dizzy on standing
• You have marked muscle weakness
• You have persistent vomiting, diarrhoea or loss of appetite
• You snore loudly or wake choking or gasping
• Anxiety, low mood or stress is making ordinary life difficult to manage
• Your symptoms began after starting, changing or stopping medication

Chest pain, fainting, severe breathlessness or rapidly worsening symptoms need more urgent assessment.

How we can help

Feeling stressed and run down often creates information overload.

One website says magnesium.

Another says cortisol.

Another says adaptogens.

The useful first step is usually to organise the picture:

What are you eating? How are you sleeping? What are you taking? What is actually bothering you — and what needs medical assessment rather than another supplement?

The purpose is not to turn feeling stressed into a shopping list. It is to help separate what you can sensibly improve yourself, what nutrition may contribute, and what deserves proper investigation.

Research record

First published: 23 August 2026
Last reviewed: 23 August 2026
Latest evidence update: 23 August 2026

Key evidence and guidance

• NHS. Get help with stress. Current NHS guidance on stress symptoms, behaviour and self-care.
• NHS. Insomnia. Current guidance on causes, sleep habits and when to seek medical advice.
• Stalder T, et al. The Cortisol Awakening Response: Regulation and Functional Significance. Endocrine Reviews. 2024.
• Endocrine Society. Adrenal Fatigue — Myth vs Fact. Explanation of the distinction between unsupported “adrenal fatigue” claims and genuine adrenal insufficiency.
• NICE. Adrenal insufficiency: identification and management — NG243. Guidance on symptoms, clinical investigation and 8–9 am serum cortisol testing.
• Arumugam V, et al. Effects of Ashwagandha (Withania Somnifera) on stress and anxiety: A systematic review and meta-analysis. Explore. 2024. PMID 39348746.
• Albalawi AA. Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress — A systematic review and meta-analysis. Nutrition and Health. 2025. PMID 40746175.
• Alsanie SA, Alhodieb FS, Askarpour M. Effects of ashwagandha (Withania somnifera) on mental health in adults: A systematic review and dose-response meta-analysis of randomized controlled trials. Complementary Therapies in Medicine. 2026. PMID 41644067.
• Łuszczak J, Kocki J. Clinical evidence for the adaptogenic effects of Withania somnifera and Rhodiola rosea — A systematic review with molecular interpretation of psychometric outcomes. Annals of Agricultural and Environmental Medicine. 2026. PMID 41906501.
• Olsson EM, von Schéele B, Panossian AG. A randomised, double-blind, placebo-controlled study of Rhodiola rosea in subjects with stress-related fatigue. Planta Medica. 2009. PMID 19016404.
• Kazemi A, et al. Effects of chamomile (Matricaria chamomilla L.) on sleep: A systematic review and meta-analysis of clinical trials. Complementary Therapies in Medicine. 2024. PMID 39106912.
• Bulman A, et al. The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis. Sleep Medicine Reviews. 2025. PMID 40056718.
• Gerolymos C, et al. Cognitive and affective effects of L-Theanine: a systematic review and meta-analysis of 31 randomized trials. Molecular Psychiatry. Published online 6 July 2026. PMID 42410082.
• Arab A, et al. The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature. Biological Trace Element Research. 2023. PMID 35184264.
• Schuster J, et al. Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial. Nature and Science of Sleep. 2025. PMID 40918053.
• Tang W, et al. A randomized, double-blind and placebo-controlled study of a Ganoderma lucidum polysaccharide extract in neurasthenia. Journal of Medicinal Food. 2005. PMID 15857210.