Adults with ADHD but no insomnia history have mild sleep problems without delayed body clock timing: a possible ADHD subtype?

Among 105 participants, ADHD participants scored in the mild insomnia range and showed reduced sleep quality compared with controls.

• ADHD participants exhibited lower sleep quality than matched controls.
• No significant differences in bedtime or mid-sleep time were found between ADHD and control groups.
• Sleep quality was consistent across stimulant, nonstimulant, and unmedicated groups.
• A correlation was observed between later timing of stimulant dosing and later sleep times among ADHD participants.
• A potential phenotype of ADHD without circadian delay was identified, characterized by insomnia and sleep quality disturbances.

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