Sleep and ADHD: Why Rest Is Harder Than It Should Be

For many people living with ADHD, the day does not end when the lights go out. The body may feel exhausted, yet the mind remains active, moving rapidly between tomorrow's plans, unfinished conversations and new ideas. Falling asleep can become a nightly challenge, while staying asleep may prove equally difficult.

Although ADHD is typically recognised for its effects on attention, impulsivity and executive function, sleep disturbance is one of its most common yet underappreciated features. Research suggests that up to 75% of adults with ADHD experience persistent sleep difficulties, including delayed sleep onset, fragmented sleep and altered circadian rhythms.¹ These challenges can affect concentration, emotional regulation, productivity and overall wellbeing.

At Reborne Longevity, we believe sleep deserves the same clinical attention as nutrition, movement and metabolic health. Through our personalised P4 medicine approach, we assess the biological, neurological and lifestyle factors that influence sleep, recognising that restorative rest forms a cornerstone of long-term health and healthy ageing.

Why ADHD and Sleep are Closely Connected

Sleep and ADHD influence one another in both directions. Many neurological features associated with ADHD naturally make it more difficult to transition into sleep; the brain often remains highly stimulated during the evening, while differences in circadian timing may delay the body's natural readiness for rest. At the same time, poor sleep can worsen many symptoms already associated with ADHD, including:

• Reduced attention and concentration

• Poor working memory

• Emotional reactivity

• Increased impulsivity

• Reduced daytime energy

• Difficulty managing stress

This creates a cycle in which disrupted sleep amplifies ADHD symptoms, making it even harder to establish healthy routines that support good-quality rest.

ADHD, Cortisol and the HPA Axis

One reason sleep becomes particularly challenging for some individuals with ADHD involves the body's stress response.

The hypothalamic-pituitary-adrenal (HPA) axis regulates cortisol, the body's primary stress hormone, which naturally follows a circadian rhythm. Levels should rise shortly before waking to promote alertness before gradually declining throughout the day, reaching their lowest point during the evening.

However, psychological stress, irregular sleep schedules, prolonged screen exposure, excessive caffeine, demanding work schedules and ongoing mental stimulation may disrupt this rhythm. Instead of winding down naturally, the nervous system can remain activated into the evening, which may contribute to:

• Difficulty falling asleep

• Frequent waking during the night

• Feeling "tired but wired"

• Poor sleep efficiency

• Morning fatigue despite adequate time in bed

Poor sleep may also further influence cortisol regulation, creating what clinicians sometimes describe as a stress-sleep cycle. Research suggests that chronic sleep restriction may alter HPA axis activity and disrupt normal cortisol rhythms, contributing to ongoing physiological stress.²

Circadian Rhythm and ADHD

Many people with ADHD naturally exhibit a delayed circadian rhythm.¹ Rather than feeling sleepy during the evening, they may experience their greatest alertness late at night. This biological tendency can make conventional sleep schedules difficult to maintain, particularly when early work or school commitments require early waking.

Supporting circadian rhythm often begins with simple but highly effective behavioural interventions, including:

• Consistent wake-up times every day

• Morning exposure to natural daylight

• Regular physical activity

• Limiting bright screens before bedtime

• Reducing caffeine later in the day

• Creating a calm, predictable evening routine

These lifestyle strategies remain the foundation of effective sleep management and should generally be prioritised before considering supplementation.³⁻⁴

Can Magnesium Help with ADHD-Related Sleep Difficulties?

Many people search for magnesium for sleep when experiencing ADHD-related insomnia. Magnesium plays an important role in normal nervous system function, muscle relaxation and neurotransmitter regulation. Although research specifically examining magnesium supplementation in ADHD remains limited, correcting magnesium deficiency may support overall sleep quality in individuals with inadequate dietary intake.⁵

Other supplements that may sometimes be considered under professional guidance include:

Magnesium Glycinate

Often selected because it combines magnesium with glycine, an amino acid involved in relaxation.

Glycine

Some studies suggest glycine may help support sleep onset and improve subjective sleep quality.

L-Theanine

Naturally found in green tea, L-theanine may promote relaxation without causing sedation in some individuals.

Melatonin

Melatonin helps regulate circadian rhythm and may be appropriate for certain people experiencing delayed sleep timing. However, timing, dosage and duration should always be discussed with an appropriately qualified healthcare professional.⁶

No supplement should replace a thorough assessment of sleep habits, medical history, medications, mental health or underlying sleep disorders. At Reborne Longevity, supplementation forms one element of a broader, personalised clinical assessment rather than serving as a standalone solution.

Sleep Hygiene for ADHD

Sleep hygiene refers to the everyday habits that support healthy sleep. For people with ADHD, these routines may require greater consistency than they do for the general population.

Evidence-informed sleep hygiene strategies include:

• Maintaining regular sleep and wake times

• Completing a "brain dump" before bed to reduce racing thoughts

• Establishing a consistent wind-down routine

• Keeping bedrooms cool, dark and quiet

• Avoiding stimulating digital content before bedtime

• Limiting alcohol close to bedtime

• Avoiding caffeine during the afternoon and evening

• Getting out of bed if unable to sleep for prolonged periods before returning when sleepy

These recommendations align with advice provided by UK health services and remain among the most effective first-line interventions for chronic sleep difficulties.³⁻⁴

Why Sleep Matters for Longevity

Sleep is one of the body's most important recovery processes. During sleep, the brain consolidates memories, regulates hormones, supports immune function, clears metabolic waste products and facilitates tissue repair.

Persistent sleep disruption has been associated with increased risk of cardiovascular disease, metabolic dysfunction, reduced cognitive performance and poorer mental wellbeing.²

At Reborne Longevity, we view sleep as a core pillar of healthy ageing alongside nutrition, exercise, metabolic optimisation and preventative medicine. Rather than simply treating symptoms, our clinicians work to identify the underlying biological and lifestyle factors contributing to poor sleep through an integrated, personalised assessment.

Specialist Sleep Medicine at Reborne Longevity

Persistent sleep problems deserve expert assessment, particularly when they occur alongside ADHD.

At Reborne Longevity, Consultant Neurologist and Sleep Disorder Specialist Dr Oliver Bernath provides comprehensive assessment and management of insomnia, circadian rhythm disorders, neurological sleep conditions and complex sleep-related symptoms as part of our multidisciplinary longevity team.

Dr. Oliver Bernath

Rather than focusing solely on sleep itself, consultations explore the wider picture, including ADHD, stress physiology, cortisol regulation, circadian rhythm, neurological health and lifestyle factors that may be contributing to poor sleep. This reflects Reborne's personalised P4 medicine philosophy, delivering preventative, predictive, personalised and participatory healthcare within a leading longevity clinic in London.

Whether sleep difficulties occur alongside ADHD or independently, specialist assessment may help identify contributing factors that are often overlooked.

To arrange a consultation with Consultant Neurologist and Sleep Disorder Specialist Dr Oliver Bernath, please contact info@rebornelongevity.com or visit Dr Bernath's profile on the Reborne Longevity website to learn more about our personalised approach to sleep medicine.

FREQUENTLY ASKED QUESTIONS

How can I improve sleep quality with ADHD, naturally?

Natural approaches to improving ADHD and sleep begin with strengthening your circadian rhythm. Aim to wake at the same time every day, seek morning daylight exposure, exercise regularly, reduce afternoon caffeine, minimise evening screen use and establish a consistent bedtime routine. Managing stress and supporting healthy cortisol regulation may also improve sleep quality. If symptoms persist, a personalised assessment at Reborne Longevity can help identify underlying neurological, hormonal or lifestyle contributors.

Where can I find a specialist sleep clinic in London for ADHD-related insomnia?

If you are looking for a specialist sleep clinic in London for ADHD-related insomnia, Reborne Longevity offers consultant-led assessment through Consultant Neurologist and Sleep Disorder Specialist Dr Oliver Bernath.

As a leading longevity clinic in London, Reborne adopts a personalised P4 medicine approach, assessing ADHD, circadian rhythm, cortisol regulation, the HPA axis, neurological health and lifestyle factors to better understand the root causes of poor sleep.

To book a consultation, visit Dr Oliver Bernath's profile or contact the team directly at info@rebornelongevity.com.

How can I track sleep patterns if I have ADHD?

Tracking your sleep over time can help identify patterns that influence concentration, energy and recovery.

At the Reborne Shop, wearable technologies including the Oura Ring 4 and WHOOP 5.0 provide detailed insights into sleep duration, sleep stages, recovery, heart rate variability and circadian rhythm. While these devices do not diagnose sleep disorders, they can provide valuable information that supports conversations with your clinician during a comprehensive sleep assessment.

Are there specific dietary supplements that can help with ADHD sleep problems?

Some individuals may benefit from clinician-guided supplementation where appropriate. Magnesium, glycine, L-theanine and melatonin are among the supplements most commonly discussed within the scientific literature for supporting healthy sleep.

At Reborne Longevity, supplementation is considered only after a comprehensive assessment of sleep habits, lifestyle, medications and overall health. Where appropriate, selected evidence-based supplements available through the Reborne Shop may be incorporated into a personalised care plan under professional guidance.

What sleep hygiene routines are recommended for ADHD by UK health services?

UK health services recommend maintaining consistent sleep and wake times, creating a calming bedtime routine, limiting caffeine and alcohol, reducing screen exposure before bed, keeping the bedroom cool and dark, reserving the bed for sleep and getting out of bed if unable to sleep rather than lying awake. These behavioural interventions remain the first-line approach for improving sleep quality in adults with ADHD and are most effective when followed consistently.

REFERENCES

1. Bijlenga D, Vollebregt MA, Kooij JJS, Arns M. The Role of the Circadian System in the Etiology and Pathophysiology of ADHD: Time to Redefine ADHD? Current Psychiatry Reports. 2015;17(8):72. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC4340974/

2. Frontiers in Psychiatry. Sleep Disorders in Adults with ADHD: Current Evidence and Future Directions. Frontiers in Psychiatry. 2025. Available at: https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2025.1697900/full

3. Derbyshire Healthcare NHS Foundation Trust. Sleep Information and Advice. Available at: https://www.derbyshirehealthcareft.nhs.uk/application/files/2416/1157/8122/Sleep_Infromation__Advice_v2.pdf

4. National Institute for Health and Care Excellence (NICE). Attention Deficit Hyperactivity Disorder: Diagnosis and Management (NG87). Available at: https://www.nice.org.uk/guidance/ng87

5. National Institutes of Health, Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals. Available at: https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/

6. National Center for Complementary and Integrative Health (NCCIH). Melatonin: What You Need To Know. Available at: https://www.nccih.nih.gov/health/melatonin-what-you-need-to-know