TL;DR
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A perspective published in Frontiers in Psychiatry on Dec. 10, 2025, reviews evidence linking ADHD in a substantial subgroup of people to delayed circadian timing and sleep problems. It proposes circadian-focused care as an adjunct to existing ADHD treatment, but the authors say larger, well-designed trials are needed to establish who benefits and how much symptoms improve.
A perspective article published Dec. 10 in Frontiers in Psychiatry argues that delayed circadian rhythms are a common and clinically relevant feature for a substantial subgroup of people with ADHD, and proposes behavioral sleep-clock interventions as an adjunct to care. The authors review evidence linking ADHD with evening chronotype and delayed biological timing, but emphasize that the relationship does not apply to everyone and that stronger trials are needed to establish treatment effects.
The article reports that sleep disturbances affect up to 80% of adults with ADHD and 82% of children, while delayed sleep-wake timing has been reported in up to 78%. It cites studies finding that dim-light melatonin onset, a marker of circadian phase, occurs about 45 minutes later in children and 90 minutes later in adults with ADHD. These are figures summarized from prior research in the perspective, not results from a new clinical trial.
The authors also describe evidence of blunted or delayed cortisol rhythms, smaller pineal gland volume in some studies, and attenuated rhythms in peripheral clock genes such as BMAL1 and PER2. The article presents these findings as converging evidence of circadian differences, while noting that ADHD and sleep disruption may interact in complex, bidirectional ways.
Intervention studies reviewed in the paper suggest that melatonin and bright light therapy can advance circadian phase in ADHD populations. Some emerging findings associate phase advancement with symptom improvement, and sleep programs have been reported to improve children’s symptoms, sleep quality and functioning. The authors propose routine screening, sleep and chronotype assessment, fixed wake times, morning light, reduced evening light and, selectively, low-dose melatonin when a delay is suspected or established.
Adding Body-Clock Screening to ADHD Care
The proposal matters because sleep problems can affect daily functioning and the experience of ADHD symptoms, while a delayed internal clock may make conventional sleep schedules difficult to follow. The authors argue that identifying this pattern could help clinicians tailor support rather than treating every person with ADHD as having the same sleep profile.
They frame circadian interventions as adjuncts, not replacements for established ADHD care. If future studies confirm benefit, screening and practical changes to light exposure and sleep timing could give clinicians additional options, particularly for people with a delayed phase. The article does not establish that these measures treat core ADHD symptoms for all patients.
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Evidence Behind the Circadian Proposal
The source is a Perspective article in Frontiers in Psychiatry, dated Dec. 10, 2025, rather than a report of a single new experiment. It brings together earlier studies of sleep, circadian markers and interventions to make the case that circadian disruption is important for a substantial subgroup of people with ADHD.
The authors distinguish a delayed body clock from sleep problems in general: studies cited include self-reported difficulties and objective measures, and some associations reportedly remain after accounting for anxiety and depression. They also describe medication-related interactions, including reports that methylphenidate may reduce unusually high daytime melatonin in some children. These observations do not by themselves establish a single mechanism linking circadian timing and ADHD.
“Circadian rhythm disruption represents a highly prevalent and clinically important phenotype”
— The perspective’s authors
bright light therapy lamp for circadian rhythm
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Who Benefits and How Much
The evidence summarized in the perspective does not show that circadian disruption causes ADHD, or that it is present in every person with the disorder. The reported sleep and biological-marker estimates come from prior studies with differing methods and populations; the article is not itself a controlled test of the proposed care pathway.
It remains unclear which people are most likely to benefit, how large or durable any symptom improvements are, and how best to set intervention timing and dose. The authors call for stratified trials to answer those questions. The article’s proposal of low-dose melatonin is a clinical suggestion, not individualized medical advice; treatment decisions should be made with a qualified health professional.
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Trials to Test Circadian-Focused Care
The next step identified by the authors is rigorous, well-designed clinical trials that measure core ADHD outcomes, identify responder profiles and compare circadian protocols. Studies could test behavioral measures, light interventions and selective melatonin use in groups characterized by chronotype or measured circadian phase.
Until such evidence is available, the article supports clinicians screening for sleep and circadian concerns and considering them as part of broader ADHD care. It does not specify a trial schedule or report a planned study, so when stronger results will be available is unclear.
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Key Questions
Does the article say ADHD is a circadian rhythm disorder?
No. It argues that circadian disruption is a clinically relevant feature for a substantial subgroup of people with ADHD, not that it defines ADHD or occurs in everyone.
How much later is melatonin onset reported in ADHD?
The perspective summarizes prior research reporting dim-light melatonin onset about 45 minutes later in children and 90 minutes later in adults with ADHD. These are averages cited from earlier studies, not measurements from the perspective itself.
What interventions do the authors propose?
They outline a behavioral-first approach: fixed wake times, morning bright light, reduced evening light and screens, regular daily timing, and selective low-dose melatonin when delayed circadian phase is suspected or confirmed. Decisions about melatonin should be discussed with a qualified health professional.
Can circadian treatment replace standard ADHD care?
The authors describe these measures as adjuncts to ADHD care, not replacements. The article does not establish that circadian interventions work for everyone or provide a substitute for an individual treatment plan.
What evidence is still needed?
The authors call for well-designed, stratified trials to establish which patients benefit, how much symptoms change, and which circadian protocols are most effective.
Source: hn
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