ADHD Insomnia: Delayed Sleep Phase and the Racing Brain

Last reviewed: 07/23/2026

Reviewed by: Dr. Kiesa Kelly

If ADHD + insomnia feels like a brain that refuses to power down, you are not alone. Bedtime is often when focus runs out and the mind turns loud. This is not always "bad habits". ADHD and sleep problems can fuel each other in a loop.[3,4]

In this article, you'll learn:

• Why ADHD and sleep problems are bidirectional, not a character flaw

• What delayed sleep-wake phase looks like and why it shows up in ADHD

• Rule-outs that get missed, including restless legs and sleep apnea

• What clinicians track to separate insomnia from circadian delay

• Supports that help, including CBT-I and circadian rhythm strategies

🧠 Key takeaway: When sleep is off, ADHD symptoms usually get louder, and when ADHD is louder, sleep is harder to protect.[3,4]

The ADHD-sleep loop: why ADHD insomnia is not "just poor habits"

Poor sleep worsens inattention and impulsivity, and ADHD makes sleep harder

Sleep supports attention, inhibition, and emotional balance. When sleep is short or fragmented, most people become more distractible and reactive.[3] Those are already hard domains for ADHD brains, so poor sleep tends to magnify the daytime struggle.[3]

ADHD traits also make it easier for nights to unravel. Shifting attention, estimating time, and initiating routines can be hard. Quiet nighttime can invite scrolling or planning spirals that delay sleep.[4]

💡 Key takeaway: The goal is not more willpower. It is changing the conditions that keep the ADHD brain online at night.[4]

Common patterns: bedtime procrastination, "second wind," nighttime hyperfocus

Common patterns include:

• Bedtime procrastination: Difficulty initiating the steps of going to bed.

• Second wind: Feeling tired earlier, then alert late in the evening.

• Nighttime hyperfocus: Getting absorbed and noticing the clock much later.

Practical example: A student plans to wind down at 11. At 10:45, they start "just one thing" for tomorrow, fall into a research rabbit hole, and it is 1:30. The next day is rushed, caffeine increases, and bedtime shifts later again.

How common are sleep problems in ADHD?

Many children exceed sleep-problem thresholds (rates vary by informant and measure)

Parent and self-report studies consistently find more bedtime resistance, sleep-onset difficulties, and daytime sleepiness in youth with ADHD than in peers.[1] Objective measures like actigraphy and polysomnography sometimes show smaller or mixed differences, which is a reminder that the definition of "sleep problem" depends on the tool.[2]

Circadian delay and delayed sleep-wake patterns are frequently reported in ADHD

ADHD is often linked with an evening chronotype and later sleep timing.[5,6] In adults with ADHD, insomnia symptoms are also commonly reported in population studies.[14]

⏰ Key takeaway: In ADHD, sleep issues are not only insomnia symptoms. Timing problems, like circadian delay, are often part of the picture.[7]

Why delayed sleep-wake phase shows up so often

Night-owl rhythm plus difficulty initiating shutdown

Delayed Sleep-Wake Phase Disorder (DSWPD) is a circadian pattern where the natural sleep window is shifted later. People may sleep adequately when allowed to follow their preferred schedule, but struggle when required to fall asleep and wake earlier for school or work.[7]

ADHD can add extra friction. Eveningness is more common in adults with ADHD and higher ADHD traits.[5,6] And many people describe high pre-sleep cognitive arousal, like racing thoughts and mental replay. Research suggests pre-sleep arousal may help explain sleep initiation problems in relation to ADHD traits.[4]

🌙 Key takeaway: A delayed clock plus a racing brain can look like insomnia, but the best plan depends on which piece is leading.[4,7]

Morning impairment: sleep inertia, lateness, missed obligations

When you are forced to wake during your biological night, mornings can feel heavy. People often report strong sleep inertia and repeated lateness, which can snowball into stress and bedtime anxiety.[7]

Practical example: An adult falls asleep at 2:00 a.m. on weekends and wakes at 10:00 a.m. feeling okay. On weekdays, they try to sleep at 11:00 p.m., lie awake for hours, then wake at 6:30 a.m. exhausted. This can be a timing problem, not only insomnia.[7]

Social jetlag: why weekends can undo weekday gains

Many people with ADHD and a delayed sleep-wake pattern sleep on one schedule during the week and a very different one on weekends. Because eveningness is more common in adults with higher ADHD traits, the natural drift is toward later nights whenever nothing is forcing an early alarm.[5][6] Sleeping until late on Saturday and Sunday, then trying to return to an early weekday wake time, is sometimes called social jetlag: the body clock is repeatedly pushed later on free days and dragged earlier on scheduled days, a little like flying across time zones every week.[6]

The cost usually shows up on Monday, when the internal clock is still set to the weekend and the early alarm lands in the middle of the biological night.[7] Keeping the wake time close to constant across the whole week is one of the steadier ways to hold a delayed clock in place, because a consistent rise time is one of the strongest signals the circadian system uses to stay aligned.[7] That does not mean giving up rest; it means anchoring the morning and letting earlier, rather than later, become the direction of travel.

Rule-outs that commonly get missed

Restless legs, PLMs, sleep apnea, and parasomnias

A few conditions can mimic or worsen ADHD symptoms:

• Restless legs syndrome (RLS): An urge to move the legs, worse at night, that delays sleep. RLS co-occurs with ADHD more than expected by chance.[10]

• Periodic limb movements in sleep (PLMS): Polysomnographic studies suggest children with ADHD are more likely than controls to have PLMS.[9]

• Sleep-disordered breathing and obstructive sleep apnea: Sleep-disordered breathing is associated with ADHD symptoms in children, so screening matters.[8]

• Parasomnias: Sleepwalking or night terrors can disrupt sleep and raise safety concerns.[7]

🔎 Key takeaway: Rule-outs protect your time and your health. Treating the wrong problem can keep you stuck.[8,10]

Anxiety, depression, caffeine, alcohol or cannabis, and medication timing

Mood and anxiety conditions can raise pre-sleep arousal.[4] Caffeine, alcohol, and cannabis can also complicate sleep quality and sleep timing, so clinicians usually ask about timing and amount.

Medication timing matters too. In youth, stimulant medications are associated with longer sleep latency and shorter sleep duration on average, so clinicians often monitor sleep and coordinate adjustments with the prescriber.[11]

What sleep testing can add beyond a sleep diary

A one-to-two-week sleep diary is often the first tool because it captures timing patterns in daily life, but some questions call for objective testing.[7] Actigraphy, a wrist sensor worn for a couple of weeks, estimates sleep and wake across many nights and can help show whether the problem is mainly timing, meaning a consistently late window, or fragmented sleep. It is worth knowing that objective measures and subjective reports do not always agree, which is part of why a careful assessment weighs both.[2]

An in-lab or at-home sleep study, called polysomnography, records breathing, oxygen, leg movements, and sleep stages across a night. That level of detail is what helps confirm or rule out conditions a diary can only hint at, such as sleep-disordered breathing or periodic limb movements.[8] Testing is not needed for everyone; it earns its place when a diary or a screening question turns up red flags like loud snoring, witnessed pauses in breathing, or leg movements that reliably delay sleep.[8] Matching the tool to the question keeps the workup efficient and pointed at the pattern that is actually driving the nights.

What a clinician will want to know (and what to track)

Sleep diary basics

A one to two week sleep diary helps identify whether this is mostly insomnia, mostly circadian delay, or both.[7] Track:

• Bedtime and lights-out time

• Estimated sleep onset time

• Night awakenings

• Wake time and out-of-bed time

• Naps

• Caffeine timing

• Alcohol or cannabis use

• Medication timing

• Screen use timing in the last hour

If you want a structured start, you can pair a diary with brief screeners like the Adult ADHD Self-Report Scale (ASRS) screener and the mental health screening tools.

"Red flag" symptoms that warrant sleep medicine evaluation

Consider a sleep medicine evaluation if you notice:

• Loud snoring, gasping, or witnessed breathing pauses[8]

• Severe daytime sleepiness or drowsy driving risk[7]

• Sleep behaviors with injury risk[7]

• Urge to move the legs that reliably delays sleep[10]

If you are unsure whether ADHD, insomnia, circadian delay, or a mix is driving the problem, a comprehensive evaluation can clarify next steps. ScienceWorks offers psychological assessments.

🩺 Key takeaway: Tracking turns "I never sleep" into patterns a clinician can treat.[7,12]

Supports that help (high-level, individualized, non-prescriptive)

Anchored wake time, light exposure, wind-down routine, screen boundaries

Many plans focus on a few levers:

• A more consistent wake time to stabilize circadian cues[7]

• Morning light exposure and dimmer evenings to support circadian rhythm alignment[7]

• Screen boundaries that limit hyperfocus triggers late at night[7]

For follow-through, executive function coaching can help build routines that match ADHD brains.

Evidence-based options: CBT-I, circadian interventions, med adjustments with a prescriber

If insomnia is prominent, CBT-I is a structured behavioral treatment that targets the behaviors and thought patterns that keep insomnia going.[12] CBT-I can be adapted for ADHD by simplifying steps, adding external supports, and planning for consistency.[12]

If circadian delay is prominent, clinical guidelines support circadian-based treatments for DSWPD, with timing and individual factors guiding what is appropriate.[7] Some studies in adults with ADHD suggest that morning bright light can advance circadian timing and may relate to symptom improvement, though this is individualized and best guided clinically.[13]

✅ Key takeaway: CBT-I helps when insomnia is the driver. Circadian supports help when timing is the driver. Many people need a blended plan.[7,12]

If you are in Tennessee and want support that integrates ADHD skills with sleep treatment, ScienceWorks offers specialized therapy and evidence-based insomnia services, including CBT-I for insomnia. You can also request a free consultation to talk through fit and options, including online therapy across Tennessee.

What CBT-I involves, and how it is adapted for ADHD

CBT-I is often named as a treatment for insomnia, but it helps to know what the sessions actually contain.[12] The core is behavioral. Stimulus control rebuilds the link between bed and sleep by reserving the bed for sleep and getting up when the mind will not settle. Sleep scheduling, sometimes called sleep restriction, matches time in bed more closely to the sleep a person is genuinely getting, which consolidates broken nights before the window is gradually widened again. A cognitive piece addresses the 2 a.m. worry loops and the "I will never function tomorrow" thoughts that keep the system switched on.[12]

For an ADHD brain, the adaptation is in the delivery, not the ingredients.[12] Steps are simplified, external supports such as reminders and visual cues carry the routine, and the plan is built for consistency rather than willpower. Because initiating and sequencing a wind-down can be the hardest part, coaching-style scaffolding and shorter, concrete actions tend to travel better than a long list of instructions. The result is a version of CBT-I shaped to fit how attention and routine actually work day to day.

A practical wind-down blueprint for the ADHD brain

Knowing that timing and arousal drive ADHD insomnia is useful, but most people want the next step: what to actually do at night. The plan below turns the levers described above into concrete, repeatable actions. None of it is a prescription, and a clinician can help tailor the pieces to whatever pattern is really driving the nights, but it shows how the parts fit together.[7,12]

Anchor the morning first

A consistent wake time and bright light soon after waking are two of the strongest signals the circadian system uses to hold its place, so they come before any change to bedtime.[7] Keeping the rise time steady across the whole week, weekends included, is what keeps a delayed clock from drifting later again.[7]

Externalize the routine

For an ADHD brain, initiating and sequencing a wind-down is often the hardest part, so the routine tends to work better when it lives outside the head: a short checklist, visual cues, and timed reminders that start the sequence rather than relying on remembering it.[12] Shorter, concrete steps travel better than a long list of rules.[12]

Give racing thoughts somewhere to go

Pre-sleep cognitive arousal, the planning and mental replay that arrive the moment demands drop, is a common thread in ADHD-related difficulty falling asleep.[4] Many plans schedule a brief written brain-dump or worry-and-plan window earlier in the evening, so the mind has already been heard by the time the lights go out.[4,12]

Protect the link between bed and sleep

A core piece of CBT-I is stimulus control: reserving the bed for sleep and getting up for a while if the mind will not settle, then returning when sleepy, so the bed stops being a place to lie awake and spin.[12] Dimmer evenings and screen limits in the last hour support the same goal, because late bright light and hyperfocus triggers both push a delayed clock later.[7]

None of these steps does much in a single night. Consistency is what turns them into a signal instead of noise, and a blended plan that matches supports to whichever piece is leading, whether timing, arousal, or the bed-sleep link, tends to hold better than any one tactic on its own.[7,12]

Clearing up common misconceptions

Misconception 1: "If I just go to bed earlier, I will fix it"

For delayed sleep-wake patterns, an earlier bedtime can increase time awake in bed and frustration. Addressing circadian timing is often more effective.[7]

Misconception 2: "It is always the stimulant medication"

Sleep changes can happen with stimulants, but sleep problems in ADHD also occur without medication. Other drivers like circadian delay or sleep disorders may be leading.[7,11]

Misconception 3: "Racing thoughts means I am doing sleep wrong"

Racing thoughts are a form of pre-sleep cognitive arousal. For many people with ADHD traits, the brain stays active when demands drop. This pattern can improve with targeted strategies.[4,12]

Using morning light to shift a delayed clock

When the main problem is a clock that runs late rather than an inability to sleep, light timing becomes one of the most useful levers.[7] Getting bright light, ideally daylight, soon after waking, and keeping evenings dimmer, sends the circadian system a steady "morning is now" signal that nudges the whole sleep window earlier over days and weeks.[7] Direction matters: light in the morning tends to pull the clock earlier, while bright light late at night pushes it later, which is one reason phones and screens in bed can quietly work against an already-delayed rhythm.[7]

For adults with ADHD specifically, some work suggests that advancing a delayed circadian phase with morning bright light may line up with improvement in daytime symptoms, though this is individualized and carried out with clinical guidance rather than as a fixed protocol.[13] Consistency is what turns light into a signal instead of noise, meaning the same wake time and the same first light most days. Paired with a steadier schedule, it gives a delayed clock a reason to move.

Conclusion

ADHD insomnia often sits at the intersection of arousal, timing, and executive functioning. When you can name the pattern, whether it is sleep-onset insomnia, delayed sleep-wake phase, a racing brain, or a rule-out like restless legs or sleep apnea, you can choose supports that match the problem.[7,8,10,12]

Frequently Asked Questions

Why does my ADHD brain race at night?

ADHD brains often have delayed sleep-wake phase patterns and an evening chronotype, meaning attention and energy peak later than is convenient for typical schedules. The result: when you finally lie down, the previously-suppressed mental load floods in (planning, problem-solving, replaying the day) — sometimes called the "second wind." Reduced melatonin onset, lower daytime exposure to bright light, and stimulant timing also play roles. The "racing" isn't a willpower problem; it's a circadian-and-attention-regulation pattern.

What is the ADHD "second wind" at night?

The ADHD second wind describes a familiar pattern: sleepiness creeps up in the evening, then suddenly disappears around 10–11 PM, replaced by hyperfocus or restless energy that can last for hours. It's connected to the delayed circadian rhythm common in ADHD: melatonin onset is later, attention regulation peaks later, and the brain reaches its "on" mode just as the body is supposed to wind down. Light exposure timing, consistent wake times, and stimulant timing can shift this.

Why does ADHD cause insomnia and racing thoughts at night?

Several mechanisms stack: delayed circadian rhythm and evening chronotype shift sleep onset later than is socially convenient; difficulty regulating attention makes "shutting down" the mental load harder; sensory hyperawareness (clock checks, ambient sounds) can amplify; and stimulant medications taken too late can extend wakefulness. Co-occurring anxiety or depression often add to the load. CBT-I adapted for ADHD — combining sleep-window scheduling with executive-function-friendly routines — is often more effective than sleep hygiene alone.

How do I calm a racing ADHD brain at night?

Racing thoughts at bedtime are a form of pre-sleep cognitive arousal, and they often ease when the brain has somewhere to put the mental load before lights-out. Many people find it helps to move planning and worry into a short written window earlier in the evening, keep a steady wake time and morning light so the body clock stops running late, and use stimulus control, getting up for a brief calm activity if the mind will not settle and returning to bed when sleepy, so the bed stays linked with sleep rather than spinning. When the pattern is persistent, CBT-I adapted for ADHD targets exactly these habits and thoughts.

Is ADHD insomnia the same as delayed sleep-wake phase disorder?

Not quite, though they overlap and often travel together. Insomnia means difficulty falling or staying asleep even when there is time and opportunity to sleep. Delayed sleep-wake phase is a circadian pattern where the whole sleep window is shifted later, so sleep can be sound when the schedule is allowed to run late but hard to reach on an early weekday timetable. In ADHD both can be present at once, which is why a one-to-two-week sleep diary is so useful: it helps separate a timing problem from a sleep-onset problem, and the two call for different emphases, circadian supports for timing and CBT-I for insomnia.

Can CBT-I help if I have ADHD?

CBT-I is a structured behavioral treatment for insomnia, and it can be adapted for ADHD by simplifying the steps, adding external supports like reminders and visual cues, and building the plan around consistency rather than willpower. The core ingredients, stimulus control, matching time in bed to the sleep a person is actually getting, and a cognitive piece for the 2 a.m. worry loop, stay the same; the delivery is what changes to fit how attention and routine work day to day.

About ScienceWorks

ScienceWorks is led by Dr. Kiesa Kelly - a clinical psychologist. She provides specialized therapy and psychological assessment services for adults, adolescents, and children, including evaluations for ADHD and related concerns.

Her approach emphasizes evidence-based care and practical skills that help clients translate insight into daily routines. At ScienceWorks, she supports clients who are navigating attention challenges, anxiety, and sleep-related concerns, with a focus on realistic, sustainable change.

References

1. Cortese S, Faraone SV, Konofal E, Lecendreux M. Sleep in children with attention-deficit/hyperactivity disorder: meta-analysis of subjective and objective studies. J Am Acad Child Adolesc Psychiatry. 2009. 48(9):894-908. https://doi.org/10.1097/CHI.0b013e3181ac09c9

2. De Crescenzo F, Armando M, Mazzone L, Ciliberto M, Sciannamea M, Figueroa C, et al. The use of actigraphy in the monitoring of sleep and activity in ADHD: a meta-analysis. Sleep Med Rev. 2016. 26:9-20. https://doi.org/10.1016/j.smrv.2015.04.002

3. Lowe CJ, Safati A, Hall PA. The neurocognitive consequences of sleep restriction: a meta-analytic review. Neurosci Biobehav Rev. 2017. 80:586-604. https://doi.org/10.1016/j.neubiorev.2017.07.010

4. Smullen D, Kolodny T, Bagshaw AP, Mevorach C, et al. Pre-sleep arousal as a possible mechanism driving sleep problems in relation to ADHD traits. Sci Rep. 2025. 15:24554. https://doi.org/10.1038/s41598-025-09866-3

5. Baird AL, Coogan AN, Siddiqui A, Donev RM, Thome J. Adult attention-deficit hyperactivity disorder is associated with alterations in circadian rhythms at the behavioural, endocrine and molecular levels. Mol Psychiatry. 2012. 17(10):988-995. https://doi.org/10.1038/mp.2011.149

6. McGowan NM, Voinescu BI, Coogan AN. Sleep quality, chronotype and social jetlag differentially associate with symptoms of attention deficit hyperactivity disorder in adults. Chronobiol Int. 2016. 33(8):988-996. https://doi.org/10.1080/07420528.2016.1208214

7. Auger RR, Burgess HJ, Emens JS, Deriy LV, Thomas SM, Sharkey KM, et al. Clinical practice guideline for the treatment of intrinsic circadian rhythm sleep-wake disorders: advanced sleep-wake phase disorder, delayed sleep-wake phase disorder, non-24-hour sleep-wake rhythm disorder, and irregular sleep-wake rhythm disorder. J Clin Sleep Med. 2015. 11(10):1199-1236. https://doi.org/10.5664/jcsm.5100

8. Sedky K, Bennett DS, Carvalho KS. Attention deficit hyperactivity disorder and sleep disordered breathing in pediatric populations: a meta-analysis. Sleep Med Rev. 2014. 18(4):349-356. https://doi.org/10.1016/j.smrv.2013.12.003

9. Sadeh A, Pergamin L, Bar-Haim Y. Sleep in children with attention-deficit hyperactivity disorder: a meta-analysis of polysomnographic studies. Sleep Med Rev. 2006. 10(6):381-398. https://doi.org/10.1016/j.smrv.2006.03.004

10. Migueis DP, Lopes MC, Casella E, Soares PV, Soster L, Spruyt K. Attention deficit hyperactivity disorder and restless leg syndrome across the lifespan: a systematic review and meta-analysis. Sleep Med Rev. 2023. 69:101770. https://doi.org/10.1016/j.smrv.2023.101770

11. Kidwell KM, Van Dyk TR, Lundahl A, Nelson TD. Stimulant medications and sleep for youth with ADHD: a meta-analysis. Pediatrics. 2015. 136(6):1144-1153. https://doi.org/10.1542/peds.2015-1708

12. Jernelöv S, Larsson Y, Llenas M, Nasri B, Kaldo V. 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. 2019. 19(1):226. https://doi.org/10.1186/s12888-019-2216-2

13. Fargason RE, Hollar D, Schmidt MH, et al. Correcting delayed circadian phase with bright light therapy predicts improvement in attention-deficit/hyperactivity disorder symptoms: a pilot study. J Psychiatr Res. 2017. 91:105-110. https://doi.org/10.1016/j.jpsychires.2017.03.004

14. Wynchank D, Ten Have M, Bijlenga D, Penninx BW, Beekman AT, Lamers F, et al. The Association Between Insomnia and Sleep Duration in Adults With Attention-Deficit Hyperactivity Disorder: Results From a General Population Study. J Clin Sleep Med. 2018. 14(3):349-357. https://doi.org/10.5664/jcsm.6976

Disclaimer

This article is for informational purposes only and does not constitute medical or mental health advice. If you have symptoms of a sleep disorder or are concerned about your safety, talk with a qualified clinician or seek urgent care.