ADHD and sleep problems in adults

Many adults with ADHD describe the same night: tired all evening, then wide awake at bedtime, mind racing, asleep well after midnight, and hard to wake in the morning. NIMH notes that sleep problems are especially common in ADHD, affecting up to 70 percent of adults with the condition. The connection runs in more than one direction, which is why sleep comes up in almost every adult ADHD evaluation.

This article covers the sleep problems most often linked with adult ADHD, what the research does and does not show, and how sleep and ADHD treatment affect each other. It is general information, not a way to diagnose yourself.

The main sleep problems linked with adult ADHD

The figures vary widely because studies use different samples and definitions. They describe groups of patients, mostly from clinics, and should not be read as your personal odds.

What sleep studies actually find

The most careful look at adult sleep in ADHD is a 2018 meta-analysis by Díaz-Román, Mitchell and Cortese. Compared with adults without ADHD, adults with ADHD reported worse sleep on seven of nine self-reported measures. On wrist activity monitors (actigraphy), they took longer to fall asleep and had lower sleep efficiency. Overnight laboratory sleep studies (polysomnography), though, showed no significant differences.

The authors concluded that self-reported sleep problems are clearly associated with adult ADHD and should be screened for in the clinical interview, but that more research is needed to know whether they reflect measurable changes in sleep itself. In practice, the main objective finding is that falling asleep takes longer.

Why the body clock matters

The circadian rhythm is the internal clock that times sleepiness and alertness. In the 2010 Dutch study by Van Veen and colleagues, adults with ADHD who had chronic trouble falling asleep started and ended sleep later and had a later melatonin onset than both healthy controls and adults with ADHD who did not have that problem. Bijlenga and colleagues have gone further and proposed that, for a substantial subgroup, part of what looks like ADHD may be the result of chronic sleep disruption, especially a delayed clock. That is a hypothesis still under study, not an established fact, but it is one reason clinicians ask about sleep timing and not only sleep length.

A late body clock collides with work and school schedules. The result can be chronic short sleep on weekdays and long catch-up sleep on weekends, which some people experience as constant fatigue.

Which comes first?

The honest answer is that it is not settled. The 2017 review by Wynchank and colleagues found mixed longitudinal evidence: one study supported a link between childhood ADHD and later insomnia and another did not. Bijlenga and colleagues describe three possibilities: ADHD causes sleep problems, sleep problems cause ADHD-like symptoms, or both share genetic and other roots. More than one may be true in the same person.

What is clear is that poor sleep on its own causes problems that overlap with ADHD. The National Heart, Lung, and Blood Institute (NHLBI) notes that sleep helps you pay attention and make decisions, and that people who are sleep deficient may have trouble making decisions, solving problems, controlling their emotions and behavior, and coping with change. That is why an evaluation has to separate a lifelong ADHD pattern from attention problems caused by sleep. The comparison article ADHD or sleep apnea covers one of the most important lookalikes, and ADHD and insomnia together covers the overlap in more detail.

ADHD medication and sleep

Treatment can also affect sleep. In placebo-controlled trials reviewed by Wynchank and colleagues, insomnia was reported significantly more often with active medication than with placebo, including with stimulants and with the nonstimulant atomoxetine. In children, a meta-analysis summarized in the World Federation of ADHD consensus statement found that stimulants shortened total sleep time and delayed sleep onset.

For some people, sleep problems come from the medication timing or type, and adjusting the plan with the prescriber helps. Others had sleep problems long before treatment. The review authors' advice is that adults with ADHD should be assessed for insomnia, and that both conditions should be treated. Never change the timing or amount of a prescribed medication on your own. The meds guide article on ADHD medication and sleep goes into this in more depth.

What treatment of sleep problems involves

Bijlenga and colleagues list approaches that target sleep quality, quantity and timing: improving sleep habits, chronotherapy (treatments that shift the body clock), treating specific sleep disorders such as restless legs or sleep apnea, and other methods still under study. Which one fits depends on what the sleep problem actually is, which is why a specific diagnosis matters more than general advice. Over-the-counter sleep aids and supplements are worth discussing with a clinician before use, especially alongside other medications.

Practical points many people find helpful include keeping a two-week sleep diary before an appointment (bedtime, time asleep, wake time, naps, caffeine and screens), and noting whether a partner has seen snoring, pauses in breathing or leg movements. Bedtime phone use is covered in ADHD and phone use.

When to talk to a clinician

Talk to a clinician if poor sleep is affecting your days, if you snore loudly or someone has noticed breathing pauses, if your legs feel restless at night, or if attention problems seem to track with how you slept. If attention, organization and restlessness problems go back to childhood and persist even after good nights, an ADHD evaluation may be worthwhile. Dr. Shershow's evaluation asks about sleep as part of a full health history and considers sleep problems as an alternative explanation or as something occurring alongside ADHD.

The free adult ADHD self-test can help you organize your symptoms first. It is a screener, not a diagnosis. To learn what a full adult assessment involves, see ADHD evaluation in New York City or ADHD evaluation in New Jersey.