Why do energy highs prevent me from sleeping (ADHD)? 

Many people with ADHD experience an unexpected burst of energy late at night, even when they feel exhausted. This “second wind” is not simply restlessness, it’s a physiological response linked to delayed circadian rhythm, dopamine dysregulation, and emotional hyperarousal. According to NHS advice, these overlapping factors make it harder for the brain to switch off, leading to delayed sleep onset and inconsistent rest. Research from Frontiers in Psychiatry suggests that 70–80% of adults with ADHD experience some form of sleep disruption tied to dopamine and circadian rhythm imbalance. 

Understanding why ADHD “energy highs” delay sleep 

At night, many people with ADHD feel mentally “switched on” just as their body should be winding down. This happens because ADHD brains often release dopamine irregularly, especially during quiet or unstimulated periods. As a result, overstimulation, racing thoughts, or bursts of focus can appear when external distractions fade. The Sleep Foundation notes that this late-evening hyperarousal can raise cortisol and adrenaline levels, keeping the body in a state of alertness even when physically tired. 

Dopamine, circadian rhythm, and hyperarousal 

ADHD is closely linked with delayed melatonin release, meaning the natural “sleep hormone” starts working later than usual. Studies in PubMed show that this shift delays bedtime and can lead to shorter, more fragmented sleep. Emotional intensity and stress can also heighten cortisol levels, making it even harder to unwind. This cycle of high alertness and delayed sleep creates inconsistent energy levels and difficulty waking up the next morning. 

Medication and behavioural influences 

Stimulant medications can sometimes worsen evening alertness if taken late in the day, though they may improve sleep indirectly by reducing daytime hyperactivity. Non-stimulant options or melatonin, as noted in NHS shared care guidelines, may help in cases of persistent insomnia. Behavioural interventions such as CBT-I (Cognitive Behavioural Therapy for Insomnia) and mindfulness are also recommended by Oxford CBT to manage racing thoughts and hyperarousal. 

Managing nighttime overstimulation 

NHS and NICE recommend maintaining consistent sleep and wake times, reducing screens before bed, and creating a calm environment with dim lighting. The Berkshire Healthcare NHS advises winding down gradually with relaxing activities such as journalling, reading, or deep breathing. For structured support, private assessment services like ADHD Certify can help review medication timing and sleep management aligned with NICE guidance. 

Key takeaway 

Energy highs in ADHD are often a sign of delayed circadian rhythm and brain hyperarousal, not simply “bad sleep habits.” Addressing this means working with, rather than against, the body’s timing, focusing on relaxation techniques, consistent routines, and gradual bedtime shifts can help reduce nighttime alertness and improve overall sleep quality. 

Harriet Winslow, BSc

Author

Harriet Winslow is a clinical psychologist with a Bachelor’s in Clinical Psychology and extensive experience in behaviour therapy and developmental disorders. She has worked with children and adolescents with ADHD, autism spectrum disorder (ASD), learning disabilities, and behavioural challenges, providing individual and group therapy using evidence-based approaches such as CBT and DBT. Dr. Winslow has developed and implemented personalised treatment plans, conducted formal and informal assessments, and delivered crisis intervention for clients in need of urgent mental health care. Her expertise spans assessment, treatment planning, and behavioural intervention for both neurodevelopmental and mental health conditions.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.