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A December 2025 perspective in Frontiers in Psychiatry argues that delayed circadian timing is a common, clinically relevant feature for a substantial subgroup of people with ADHD, not a feature of everyone with the condition. It reviews evidence for later biological rhythms and early intervention findings, while calling for larger, well-designed trials before circadian treatment can be defined or recommended as a standard approach.
A perspective article published Dec. 10, 2025, in Frontiers in Psychiatry argues that circadian rhythm disruption is a common and clinically relevant feature for a subgroup of people with ADHD, and proposes sleep- and light-based measures as adjuncts to care. The authors draw on existing studies and early intervention findings; the article is not a new clinical trial, and it does not establish circadian treatment as a replacement for standard ADHD care.
The authors describe a pattern of evening chronotype and delayed sleep-wake timing in many people with ADHD. The article reports that sleep disturbances affect up to 80% of adults and 82% of children with ADHD, while delayed sleep-wake timing has been reported in up to 78%. These are upper estimates drawn from cited studies, not rates that apply to every person with ADHD.
Biological measures also point to later timing. The perspective reports that dim-light melatonin onset, a marker of the body’s internal clock, is delayed by about 45 minutes in children and 90 minutes in adults with ADHD in the studies it reviews. It also summarizes evidence of altered cortisol rhythms, smaller pineal gland volume and weaker rhythms in peripheral clock genes, including BMAL1 and PER2. The findings indicate associations and possible biological differences; they do not show that circadian disruption causes ADHD.
Intervention research reviewed in the article suggests that circadian timing can be shifted. Studies using melatonin and bright-light therapy have advanced melatonin timing in ADHD groups, and some findings link phase advancement with symptom improvement. The authors also cite sleep programs that improved sleep and functioning in children. They propose screening for sleep problems, tracking sleep and chronotype, and using routines such as fixed wake times and morning light, while reserving low-dose melatonin for people with confirmed or likely delays. These are proposals for adjunctive care, not a universal treatment instruction.
What Circadian Screening Could Add
The perspective’s practical point is that sleep timing may be a treatable part of ADHD care for some patients. If clinicians ask about late sleep schedules and persistent sleep problems, they may identify difficulties that routine symptom assessments alone do not capture. A circadian-informed plan could complement existing treatment by addressing sleep regularity and light exposure alongside other care.
That possibility matters because sleep problems can affect daytime functioning and may overlap with ADHD symptoms. The article frames the relationship as complex and bidirectional: ADHD and circadian disruption may interact, but the evidence does not establish a single cause or show that resetting the body clock will improve symptoms for everyone. The authors call for studies that identify which patients are most likely to benefit and measure core ADHD outcomes, rather than sleep timing alone.
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Evidence Behind the Circadian Link
The publication is a perspective article in the sleep disorders section of Frontiers in Psychiatry, not a systematic review newly pooling all available data or a treatment guideline. It brings together prior research on sleep reports, biological timing markers and interventions to argue that circadian features deserve more attention in ADHD care.
The authors describe delayed timing in a substantial subgroup, while stressing that it does not characterize every person with ADHD. They also note that some sleep-related findings persist after accounting for anxiety and depression in cited studies. Earlier work has examined melatonin patterns and medication effects, but the perspective presents these as parts of a complex relationship between ADHD treatment and circadian biology, not proof of a settled mechanism.
“Circadian rhythm disruption represents a highly prevalent and clinically important phenotype that interacts with ADHD symptoms in complex, bidirectional ways in a substantial proportion (though not all) of individuals.”
— Authors of the Frontiers in Psychiatry perspective
Limits of the Current Evidence
The perspective summarizes findings from earlier studies, and the reported prevalence and timing estimates come from those studies rather than a single new sample. How many people with ADHD have a clinically meaningful circadian delay remains uncertain; estimates may differ with the population and measurement method. The article also does not establish whether delayed rhythms contribute to ADHD symptoms, result from them, or reflect other influences in a given person.
Intervention evidence is still developing. The source describes phase advances with melatonin and bright light, alongside emerging links between timing changes and symptom improvement, but it does not provide a basis to conclude that these approaches reliably improve core ADHD symptoms across patients. The best candidates, treatment timing, dose and duration, and long-term outcomes remain unsettled. The article’s proposed pathway should not be read as an individualized prescription; melatonin use and light interventions should be discussed with a qualified clinician, particularly when other health conditions or medications are involved.
Trials to Test Circadian Care
The authors call for larger, well-designed and stratified trials to test whether circadian-focused interventions improve core ADHD symptoms, identify likely responders and determine the best protocols. Future studies could compare interventions, track biological timing as well as symptoms, and clarify how treatment interacts with sleep schedules and existing ADHD care.
For now, the article’s recommendation is to give sleep and circadian screening a more routine place in ADHD assessment, with individualized follow-up where problems are found. It does not set a timetable for new trials or identify a forthcoming clinical guideline, so when and how these proposals might become standard practice remains unknown.
Key Questions
Does the article say ADHD is caused by a circadian rhythm disorder?
No. The authors describe circadian disruption as a common feature in a subgroup and say it may interact with ADHD symptoms. The perspective does not establish that it causes ADHD or applies to everyone with the condition.
What circadian changes does the perspective report?
It summarizes later sleep-wake timing and delayed dim-light melatonin onset, estimated in cited studies at about 45 minutes in children and 90 minutes in adults with ADHD. It also discusses altered cortisol rhythms and other biological findings.
Does shifting circadian timing improve ADHD symptoms?
Some early findings reviewed in the article link circadian phase advancement with symptom improvement, and sleep programs have reported benefits in children. The evidence is not yet sufficient to show that circadian interventions improve core symptoms for all patients.
What interventions do the authors propose?
The proposed adjunctive pathway includes sleep and chronotype screening, fixed wake times, morning bright light, reduced evening light and regular daily cues. The authors suggest considering low-dose melatonin for confirmed or probable timing delays; patients should consult a clinician rather than treat the proposal as personal dosing advice.
Source: hn
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