Uncovering sleep in young males with Duchenne muscular dystrophy.

OBJECTIVES

Sleep health in rare disease is often overlooked due to the complex nature of the disease. For males with Duchenne muscular dystrophy, sleep assessment is typically focused on pulmonary function and identification of sleep disordered breathing. Unfortunately for young boys with Duchenne muscular dystrophy, sleep assessment is often neglected, resulting in a dearth of knowledge on sleep health in this population. This study describes sleep quantity and quality in both younger (4-9 years) and older (10-17 years) males with Duchenne muscular dystrophy (n = 19) and compares these characteristics with sleep characteristics of unaffected peers (n = 17).

METHODS

This study was a longitudinal, observational study. Sleep measures were collected using the parent-proxy Children's Sleep Habits Questionnaire-Abbreviated version and objective sleep measures from actigraphy (sleep efficiency, awakenings, and awakening duration) over 30 days for all participants. Means and standard deviations were examined, and effect sizes were computed to quantify the magnitude of difference between the Duchenne muscular dystrophy and unaffected groups.

RESULTS

Overall, boys with Duchenne muscular dystrophy were found to experience worse sleep than their unaffected peers as measured by parent report and actigraphy. Effect sizes of both measures demonstrated moderate to large magnitudes of difference in many of the sleep variables. Parents of boys with Duchenne muscular dystrophy reported higher scores (indicating worse sleep) in all subsections and total score of the Children's Sleep Habits Questionnaire - Abbreviated version. Actigraphy data indicated that the Duchenne muscular dystrophy group had lower percent sleep efficiency, more night awakenings and longer duration of night awakenings than their unaffected peers.

CONCLUSION

Our findings offer a novel look into sleep in young boys with Duchenne muscular dystrophy. Both parent-report and actigraphy data indicate poor sleep health in this population compared with age-matched unaffected peers. Actigraphy was found to align with parent-report of sleep in this population, supporting the use of these two different ways to measure sleep in Duchenne muscular dystrophy. Results from this study should encourage clinicians and researchers alike to further explore sleep and its impact on disease in young boys with Duchenne muscular dystrophy.