Sleep and disruptive mood dysregulation disorder: A pilot actigraphy study

Area of Science:

• Pediatric Sleep Medicine
• Child and Adolescent Psychiatry
• Neuroscience

Background:

• Disruptive Mood Dysregulation Disorder (DMDD) is a condition characterized by persistent irritability and frequent temper outbursts.
• Sleep disturbances are common in pediatric psychiatric disorders, but specific sleep activity profiles in DMDD are not well understood.

Purpose of the Study:

• To investigate the sleep patterns and motor activity during sleep in children and adolescents diagnosed with DMDD.
• To compare sleep parameters between school days and non-school days.

Main Methods:

• Utilized wrist actigraphy for 9 consecutive days in 21 youths (mean age 11.7 years) with DMDD.
• Measured sleep latency, sleep efficiency, and wakefulness after sleep onset (WASO).
• Analyzed sleep data by dividing night-time recordings into three sections to compare early and late night periods.

Main Results:

• Participants commonly had comorbid psychiatric conditions like ADHD, depression, or anxiety.
• Later bedtimes and activity onset were observed on non-school days, though total sleep time remained similar.
• Sleep efficiency was higher on non-school days, but sleep remained fragmented overall.
• A significantly higher number of WASO episodes occurred in the last third of the night, coinciding with REM sleep.

Conclusions:

• Youth with DMDD exhibit fragmented sleep patterns.
• The increased frequency of wakefulness during the latter part of the night, associated with REM sleep, may indicate impaired motor inhibition during this sleep stage.