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The middle of the night

ADHD and insomnia: why they travel together and what helps

Late body clocks, a brain that will not switch off, and medication timing all play a part. How ADHD and insomnia feed each other, and what CBT-I changes.

4 min read

Last reviewed November 11, 2026

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ADHD does not always cause insomnia, but the two show up together often, and ADHD can push sleep off course in three ways: a body clock that runs late, a mind that will not settle at bedtime, and the timing of stimulant medication. Poor sleep then makes attention, mood and impulse control harder the next day. The useful question is which of those is driving your nights, because each has a different fix.

Why ADHD and insomnia go together

A body clock that runs late

Many people with ADHD are night owls in a more literal sense than most. Their internal clock is shifted later, so the sleepy window does not open until well after a conventional bedtime. Go to bed at 11pm with a clock set for 2am, and you will lie awake. Not because anything is broken, but because your body does not think it is night yet. When this is the main issue it is often called delayed sleep phase, and it is a timing problem more than an insomnia problem.

A mind that keeps going

Bedtime is the first quiet moment of the day for a lot of people with ADHD. The ideas, the unfinished tasks and the half-remembered conversations all arrive at once. That is the same racing mind many people with insomnia describe, often louder.

Routines that drift

Hyperfocus at 10pm, one more episode, a phone in bed, a lie-in at the weekend. Each is understandable. Together they make your sleep timing unpredictable, and an unpredictable clock makes insomnia more likely.

Stimulant medication and sleep

The timing of stimulant medication can affect sleep for some people, and so can the period when a dose wears off. Others find their sleep is no different, or even more settled. It varies.

If you think your medication is part of the picture, note in a sleep diary when you take it and how you sleep, for a week or two. Then bring that to your prescriber. Do not change the dose or the time you take it on your own. That decision belongs with the person who prescribes it, who can weigh sleep against how your days go.

Late body clock vs insomnia

Late body clockInsomnia
On your own schedule (holiday, weekend)Falls asleep easily, sleeps wellStill struggles to sleep
Main complaintCan't fall asleep early; can't wake up earlyCan't fall asleep, stay asleep, or both, at any hour
Worry about sleep itselfUsually lessOften a large part of it
What tends to helpTimed morning light, a steady wake time, shifting graduallyCBT-I: a sleep window, stimulus control, working with thoughts about sleep

Plenty of people with ADHD have both. That is worth knowing, because a strict early bedtime can make insomnia worse if your clock is not ready for it.

What CBT-I looks like with ADHD

CBT-I is the first-line treatment for chronic insomnia in adults, and it has been studied in adults with ADHD. The core is the same: a sleep window based on how much you actually sleep, getting out of bed when you cannot sleep, and changing the thoughts that keep you alert. A few adjustments make it more workable:

  1. Set the window around your real clock. If you are never sleepy before 1am, start the window there and move it earlier in small steps, rather than starting at 11pm and lying awake.
  2. Anchor the morning. The same rising time every day matters more than bedtime. Get outdoor light soon after you wake.
  3. Make the diary almost effortless. A phone reminder at the same time each morning and a diary with as few taps as possible. A sleep diary is the part that makes the rest work.
  4. Park the ideas before bed. Ten minutes earlier in the evening writing down tasks and ideas, so they are not waiting for you in the dark.
  5. Give the last hour a hard stop. An alarm that says "screens off" works better than willpower at 11:30pm.

If you are drowsy during the day, take care with driving. If your mood is low or you have thoughts of harming yourself, call or text 988 in the US. For when anxiety is the bigger part, see insomnia and anxiety.

Somnera is a self-guided education program built on CBT-I. It is not a diagnosis and does not replace care from your own clinician. The assessment is free and gives you a real score.

Citations

  • Edinger JD, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2021;17(2):255–262. doi:10.5664/jcsm.8986
  • Qaseem A, et al. Management of chronic insomnia disorder in adults: a clinical practice guideline from the American College of Physicians. Ann Intern Med. 2016;165(2):125–133. doi:10.7326/M15-2175
  • Morin CM, Benca R. Chronic insomnia. Lancet. 2012;379(9821):1129–1141. doi:10.1016/S0140-6736(11)60750-2

Frequently asked questions

ADHD and insomnia often occur together, and ADHD can contribute to it through a later body clock, a busy mind at bedtime and irregular routines. Poor sleep then makes attention and mood harder, so each feeds the other.

Many people with ADHD have a body clock that runs late, so they are not sleepy at a conventional bedtime. Add a mind that keeps generating ideas and a habit of one more task or one more video, and falling asleep becomes harder.

The timing of stimulant medication can affect sleep for some people. Do not change your dose or timing on your own; discuss it with your prescriber, who can look at the whole picture.

CBT-I has been studied in adults with ADHD, and the core techniques are the same. People with ADHD may need extra structure, such as reminders and a very simple diary, and may need to address a late body clock alongside it.

If you fall asleep easily and sleep well when you can choose your own hours, say 2am to 10am, the main problem may be timing rather than insomnia. If you struggle to sleep even on your own schedule, insomnia is more likely, and both can be present.

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