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Review / Everyday Life / teens + adults

Sleep and ADHD feed each other in both directions

Reviews of sleep and circadian research in ADHD point to a delayed body clock in a large share of adults — and a loop that runs both ways.

EvidenceModerate

The short version

Review · teens + adults · 2013

Adults with ADHD show delayed sleep onset and later circadian timing at much higher rates than the general population.

Short or badly timed sleep then worsens next-day attention and emotional regulation.

This is a loop to interrupt, not a single cause to blame.

01

What they studied

  • Reviews of sleep questionnaire, actigraphy and circadian marker studies in adults with ADHD, alongside intervention work on sleep timing.
  • The focus was on sleep onset timing, sleep duration, and the relationship with daytime symptoms.
02

What they found

  • Delayed sleep phase was substantially more prevalent in ADHD samples than in comparison groups.
  • Sleep restriction worsened attention and emotional regulation the next day.
  • Treating sleep timing improved daytime functioning in some studies.
03

Why it matters

  • For many adults, the front end of the night is the highest-leverage thing to change — more than optimising the day.
  • It's also a reason to be careful with blanket 'just go to bed earlier' advice: if the body clock is shifted, timing beats willpower.
04

What it doesn't mean

  • Correlation runs in both directions; poor sleep is not established as a cause of ADHD.
  • Medication timing can affect sleep, which complicates interpretation.
  • Findings are in teens and adults, not young children.

The bigger picture

Moderate and steadily strengthening. The association is consistent; causal direction and best treatment sequencing are still being worked out.

EvidenceModerate

Original research

Authors
Kooij, J. J. S., & Bijlenga, D.
Study title
The circadian rhythm in adult attention-deficit/hyperactivity disorder: current state of affairs
Journal
Expert Review of Neurotherapeutics
Year
2013
Study design
Review
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