Idiopathic Chronic Sleep Onset Insomnia in Attention‐Deficit/Hyperactivity Disorder: A Circadian Rhythm Sleep Disorder

The mean sleep onset time in ADHD children with sleep-onset insomnia was 21:38, significantly later than 20:49 in those without insomnia.

• Children with ADHD and chronic sleep-onset insomnia exhibited a delayed sleep phase.
• Dim light melatonin onset occurred later in children with sleep-onset insomnia, at 20:32 compared to 19:47 in those without insomnia.
• Wake-up time was also later in children with insomnia compared to those without.
• No significant differences were found between the groups regarding sleep maintenance or rhythm variability.

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