Adult ADHD · Body and daily foundations

Sleep and adult ADHD

Sleep cycles, evening routines and daytime tiredness, and how to build a workable transition from activity to rest.

Nisha Bal · Founder & Principal OT
Updated 11 October 2026

Watch videoMinimise video4:52Sleep and adult ADHD

Watch with chapters and the full transcript →

Sleep is so important in adult ADHD that I want it near the centre of the conversation. A person who is constantly tired is doing the day's work with an additional load. They may still be energetic, talkative or restless, but that does not tell us whether their sleep is adequate. I want to understand the whole night and the day that follows it: when sleep begins, what interrupts it, when waking happens and what the person feels like afterwards.

Both non-REM and REM sleep matter. They occur in repeated cycles, with deep non-REM sleep generally more prominent earlier in the sleep period and REM periods lengthening later. Protecting a whole night gives those cycles room. Sleep participates in learning, memory and bodily regulation; it is an active process, even though we are resting. My interest in Why We Sleep comes from taking that activity seriously and recognising how easily modern routines consume the time it requires.

When I say sleep hygiene is paramount, I mean that we must examine the conditions in which sleep is being attempted. Bright evening light, screens within reach and content without an ending can all belong to a late-night pattern. Reducing light and getting away from screens gives the evening a clearer transition. It also removes the next reel, episode or message that keeps offering a reason to remain awake. A winding-down routine needs an actual place in the day; leaving it until every other demand is finished often leaves no time for it.

Bedtime itself contains executive demands. You have to notice the time, stop an activity, accept unfinished work, prepare for tomorrow and change state. Someone may know perfectly well that they should go to bed and still struggle with this sequence. We can make its building blocks visible: a last point for work, a place for the phone, what needs preparing and the first action that begins winding down. An OT can work through that sequence with the person rather than leaving “sleep earlier” as a large, vague instruction.

We also need to ask what late evening means to someone. It may be the only quiet time after work, care and social demands. Giving it up can feel like losing the only part of the day that belongs to you. In that situation, a bedtime plan needs some attention to daytime boundaries and recovery. There may also be a later internal sleep rhythm. Recent adult actigraphy research found later and less stable rest–activity patterns in newly diagnosed ADHD. Understanding a person's timing gives us a better starting point than repeatedly asking them to lie awake earlier.

Sleepiness and ADHD symptoms need careful attention together. Adult studies show that losing sleep worsens attention, and that visible daytime sleepiness is associated with more missed responses. I ask people to notice whether a difficult morning follows a short night, repeated waking, a late sleep period or an adequate night that still leaves them unrefreshed. Persistent insomnia, gasping, loud snoring, restless legs and marked daytime sleepiness deserve clinical assessment. A routine can be carefully designed and still need a sleep disorder addressed.

Medication belongs in this account as well. Review what happens to sleep as treatment, dose or timing changes. A recent eighteen-month adult clinic study found better reported sleep outcomes associated with ADHD medication use. The person's own pattern matters: treatment may help them organise an evening, while a particular prescription or timing may also require adjustment. Working on sleep alongside medication review allows both parts of care to respond to the actual difficulty.

For a practical beginning, choose one change that protects the night: an earlier ending to content, less bright light, a realistic waking time or help with the evening transition. Observe sleep and the following day, then review. If sleep remains difficult, deepen the assessment. A recent trial of added sleep treatment found improvements in sleep quality and fatigue. Those outcomes matter in their own right. I want people to have enough rest to live their day, and enough support to make that rest possible.

The evidence behind the article

Research notes and references

Facts: adult sleep-loss and sleepiness studies support assessing sleep-related attention difficulties. Deep non-REM and REM distributions refer to the sleep period, not a fixed clock time; going to bed early does not automatically secure a particular stage. Human sleep participates in memory and regulation, while REM synaptic-pruning findings cited previously are from mice. “Resetting all neurotransmitters” is not established. Added sleep treatment improved sleep quality/fatigue without additional ADHD-symptom improvement. The 149-person medication study is observational; the earlier randomised medication reanalysis found benefit across baseline sleep groups. Interpretation: prioritising disrupted sleep is clinical judgement. Patient application: support timing/transitions and investigate persistent symptoms. For chronic insomnia, structured CBT-I has stronger support than sleep hygiene alone; the ADHD-adapted pilot was uncontrolled. Why We Sleep is an author influence rather than a primary source.

References: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

Díaz-Román, A., Mitchell, R., & Cortese, S. (2018). Sleep in adults with ADHD: Systematic review and meta-analysis of subjective and objective studies. Neuroscience & Biobehavioral Reviews, 89, 61–71. doi: 10.1016/j.neubiorev.2018.02.014.
Read source 1
Study notes
Adult-specific systematic review of subjective and objective sleep. Supports screening sleep difficulties; does not establish a universal REM or deep-sleep deficit. Full abstract and bibliographic record verified; publisher full text unavailable.
National Heart, Lung, and Blood Institute. (2022, 24 March). How Sleep Works: Sleep Phases and Stages.
Read source 2
Study notes
Official physiology resource, full page inspected. Explains REM and non-REM stages and their distribution across the night. Does not establish a universal clock-time deadline for deep sleep or support a simple neurotransmitter-reset claim.
National Heart, Lung, and Blood Institute. (2022, 24 March). How Sleep Works: Your Sleep/Wake Cycle.
Read source 3
Study notes
Official general physiology resource, full page inspected. Supports attention to body-clock differences, environmental light and caffeine. Circadian treatment protocols should be individualised; this is not an ADHD intervention trial.
Edinger, J. D., Arnedt, J. T., Bertisch, S. M., Carney, C. E., Harrington, J. J., Lichstein, K. L., Sateia, M. J., Troxel, W. M., Zhou, E. S., Kazmi, U., Heald, J. L., & Martin, J. L. (2021). Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine, 17(2), 255–262. doi: 10.5664/jcsm.8986.
Read source 4
Study notes
General adult guideline recommends multicomponent CBT-I and advises against sleep hygiene alone for chronic insomnia. Citation and recommendations verified from indexed text; full official AASM patient summary inspected when publisher and PMC retrieval were blocked.
National Institute for Health and Care Excellence. (2018; current online recommendations accessed October 2026). Attention deficit hyperactivity disorder: diagnosis and management (NG87).
Read source 5
Study notes
Official guidance covers adult care, sleep monitoring and appetite or weight review. Child-only dietary recommendations are not treated as adult evidence. Relevant passages were checked in indexed text when direct access was blocked.
Jernelöv, S., Larsson, Y., Llenas, M., Nasri, B., & Kaldo, V. (2019). Effects and clinical feasibility of a behavioral treatment for sleep problems in adult attention deficit hyperactivity disorder (ADHD): a pragmatic within-group pilot evaluation. BMC Psychiatry, 19, 226. doi: 10.1186/s12888-019-2216-2.
Read source 6
Study notes
Nineteen-person adult pilot of adapted CBT-I showed insomnia improvement. No control group; cannot establish causation or identify which adaptations mattered. Full methods, results and limitations inspected. Preliminary ADHD-specific evidence alongside stronger general adult insomnia guidance.
van Andel, E., Bijlenga, D., Vogel, S. W. N., Beekman, A. T. F., & Kooij, J. J. S. (2022). Attention-Deficit/Hyperactivity Disorder and Delayed Sleep Phase Syndrome in Adults: A Randomized Clinical Trial on the Effects of Chronotherapy on Sleep. Journal of Biological Rhythms, 37(6), 673–689. doi: 10.1177/07487304221124659.
Read source 7
Study notes
Exploratory secondary analysis in adults with ADHD and delayed sleep phase. Melatonin shifted biological timing without clearly improving actual sleep timing or general sleep. Small sample and selected population limit conclusions. Proposed added behavioural coaching was not tested.
Adler, L. A., Goodman, D., Weisler, R., Hamdani, M., & Roth, T. (2009). Effect of lisdexamfetamine dimesylate on sleep in adults with attention-deficit/hyperactivity disorder. Behavioral and Brain Functions, 5, 34. doi: 10.1186/1744-9081-5-34.
Read source 8
Study notes
Secondary sleep analysis of adult placebo-controlled trial. Insomnia reports increased, but overall self-rated sleep quality did not significantly worsen. Four-week duration, selected population and industry sponsorship limit generalisation. Supports individual monitoring rather than claims about all stimulant users.
Gardiner, C., Weakley, J., Burke, L. M., Roach, G. D., Sargent, C., Maniar, N., Townshend, A., & Halson, S. L. (2023). The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 69, 101764. doi:10.1016/j.smrv.2023.101764.
Read source 9
Study notes
Twenty-four studies support caffeine effects on sleep duration, timing and depth. General adult sleep evidence, not ADHD-specific. Model-derived cutoff estimates should not become a universal exact last-coffee time.
Walker, M. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner.
Read source 10
Study notes
Optional popular science reading, with edition details verified through the publisher. Not a clinical guideline or an adult ADHD treatment trial.
Li, W., Ma, L., Yang, G., & Gan, W.-B. (2017). REM sleep selectively prunes and maintains new synapses in development and learning. Nature Neuroscience, 20, 427–437. doi:10.1038/nn.4479.
Read source 11
Study notes
Primary mouse motor-cortex experiments measured dendritic spines during development and motor learning. REM sleep supported both selective elimination and maintenance of new synapses. Publisher abstract and indexed primary full-text results checked. This provides a specific basis for the pruning idea, concerning synapses rather than whole neurons; it is not an adult ADHD study.
de Vivo, L., et al. (2017). Ultrastructural evidence for synaptic scaling across the wake/sleep cycle. Science, 355(6324), 507–510. doi:10.1126/science.aah5982.
Read source 12
Study notes
Primary mouse experiment measured 6920 cortical synapses. Axon-spine contact area was smaller after sleep, with selective rather than uniform scaling. Primary indexed abstract checked. Supports investigating sleep-dependent synaptic adjustment, not a global biochemical reset in adults with ADHD.
Van Veen MM, Kooij JJS, Boonstra AM, Gordijn MCM, Van Someren EJW. Delayed circadian rhythm in adults with attention-deficit/hyperactivity disorder and chronic sleep-onset insomnia. Biological Psychiatry. 2010;67(11):1091–1096. doi:10.1016/j.biopsych.2009.12.032.
Read source 13
Study notes
40 adults with diagnosed ADHD, 31 reporting chronic sleep-onset insomnia, compared with matched healthy controls. The ADHD group with sleep-onset insomnia had later sleep timing and later dim-light melatonin onset than both controls and ADHD adults without that insomnia. Both ADHD groups took longer to fall asleep and had lower sleep efficiency than controls. Small selected sample; observational. The 31/40 figure is not a population prevalence estimate. It supports circadian assessment for relevant patients, without showing that every adult with ADHD has a delayed clock or that simply going to bed earlier fixes it.
Dan O, Cohen A, Asraf K, Saveliev I, Haimov I. The Impact of Sleep Deprivation on Continuous Performance Task Among Young Men With ADHD. Journal of Attention Disorders. 2021;25(9):1284–1294. doi:10.1177/1087054719897811. First published online January 9, 2020.
Read source 14
Study notes
34 young men: 16 with ADHD and 18 without ADHD; mean age 25.38 years. Sleep deprivation worsened missed responses, incorrect responses, reaction time and response variability in both groups. The ADHD group performed worse overall, but the published study concluded that both groups were similarly affected by deprivation. Small male sample, extreme acute sleep loss and repeated task testing. This is direct adult ADHD evidence for impaired attention after sleep deprivation; it does not quantify the impact of ordinary short nights, establish worsening across every clinical ADHD symptom or show greater vulnerability in all ADHD adults.
Helfer B, Bozhilova N, Cooper RE, Douzenis JI, Maltezos S, Asherson P. The key role of daytime sleepiness in cognitive functioning of adults with attention deficit hyperactivity disorder. European Psychiatry. 2020;63(1):e31. doi:10.1192/j.eurpsy.2020.28.
Read source 15
Study notes
111 adults, including 81 with diagnosed ADHD and 30 controls; mean overall age 32.4 years. ADHD participants withheld stimulant medication for at least 48 hours before testing. Adults with ADHD were sleepier during the attention task. Within ADHD participants, observable sleepiness correlated with missed responses even after accounting for ADHD symptom severity. Sleepiness deserves assessment when someone appears inattentive or inconsistent. Sleep was not experimentally improved or restricted, so this does not establish that sleep loss caused ADHD or that treating sleep resolves ADHD. Observer-rated sleepiness is distinct from the cause of that sleepiness; resting EEG slowing was not explained simply by normal drowsiness.
Surman CBH, Robertson B, Chen J, Cortese S. Post-Hoc Analyses of the Effects of Baseline Sleep Quality on SHP465 Mixed Amphetamine Salts Extended-Release Treatment Response in Adults with Attention-Deficit/Hyperactivity Disorder. CNS Drugs. 2019;33(7):695–706. doi:10.1007/s40263-019-00645-z.
Read source 16
Study notes
268 adults in the intention-to-treat population, aged 18–55, with ADHD; 136 received extended-release mixed amphetamine salts and 132 placebo. Medication improved ADHD symptoms and executive functioning in participants with and without baseline sleep impairment. Comparisons between sleep groups did not establish a different medication effect. Some short-duration or low-efficiency subgroups had weaker trends, which the authors considered exploratory. Secondary analysis; self-reported sleep; small subgroups; no multiple-comparison adjustment; major psychiatric comorbidity excluded; industry funded. It provides direct contrary evidence to categorical medication failure during poor sleep, without establishing that sleep never affects an individual's response.
Pinggal E, Jackson J, Kusztor A, Chapman D, Windt J, Drummond SPA, Silk TJ, Bellgrove MA, Andrillon T. Sleep-Like Slow Waves during Wakefulness Mediate Attention and Vigilance Difficulties in Adult Attention-Deficit/Hyperactivity Disorder. Journal of Neuroscience. 2026;46(15):e1694252025. doi:10.1523/JNEUROSCI.1694-25.2025.
Read source 17
Study notes
32 adults with ADHD and 31 adults without ADHD. The ADHD group showed more sleep-like slow waves during wakefulness. Greater slow-wave density was associated with missed responses, slower and more variable responses, and subjective sleepiness. This offers a possible link between arousal and fluctuating attention. Association and statistical mediation do not prove that inadequate night-time sleep caused the waves or ADHD. No sleep treatment was tested. It is an emerging mechanism, not evidence that ADHD is simply tiredness or that adequate sleep eliminates it.
Walter, A., Martz, É., Weiner, L., et al. (2026). Sleep, rest-activity rhythm, cognitive and emotional symptoms in adult ADHD: unraveling the links with an actimetry-based approach. BMC Psychiatry, 26, 317. doi:10.1186/s12888-026-07947-9.
Read source 18
Study notes
Primary observational study: 54 newly diagnosed, stimulant-naïve adults with ADHD and 47 controls; roughly 10 days of wrist actigraphy. ADHD adults had a later rest phase and less stable day-to-day activity rhythms after age/sex adjustment. Most exploratory sleep/cognition correlations did not survive multiple-testing correction. Supports assessing timing and regularity as part of sleep care; no intervention or causal claim. Full methods, results and limitations read.
Van der Ham, M., Bijlenga, D., Molenaar, N., et al. (2026). The Effects of Sleep Treatment on Symptoms of ADHD, Sleep Quality, Fatigue, and Depressive Symptoms in Adults. Journal of Attention Disorders, 30(3), 354–369. doi:10.1177/10870547251379103. First published online 27 October 2025.
Read source 19
Study notes
Preliminary open-label randomized trial: 70 adults with diagnosed ADHD and a positive sleep-disorder screen. Added sleep treatment improved subjective sleep quality (between-group β=-1.98; d=0.42) and fatigue (β=-6.52; d=1.59) beyond usual ADHD care, without significant additional ADHD-symptom reduction. Twenty percent missed final assessment. Abstract and appendix read; appendix gives 25/22/23 participants, correcting the abstract's inconsistent 25/22/33. Supports treating sleep as a meaningful clinical outcome in its own right.
Adamis, D., Tiernan, J., Langan, N., Gavin, B., & McNicholas, F. (2026). Effects of medications on sleep quality, insomnia, and circadian rhythm in adults with ADHD: a pragmatic longitudinal study. Sleep Medicine, 138, 108721. Published online December 2025. doi:10.1016/j.sleep.2025.108721.
Read source 20
Study notes
Primary indexed PubMed abstract and publisher study description inspected; full article not accessible. Prospective Irish specialist-clinic cohort: 149 diagnosed adults assessed at five points over 18 months using reported sleep measures and mixed-effects models. Stimulant use was associated with better sleep quality and less insomnia; atomoxetine with less insomnia/circadian sleep disorder. Psychiatric comorbidity and other prescriptions also related to outcomes. Treatment was not randomised, so confounding and clinical selection prevent a causal medication conclusion.

← Browse all adult resources Back to the article ↑

Research notes and references

Explore Body and daily foundations