Lisa Keenan1, Clara Sherlock2, Jessica Bramham3, Michelle Downes4. 1. School of Psychology, University College Dublin (UCD), Belfield, Dublin, Ireland. Electronic address: lisa.keenan1@ucdconnect.ie. 2. School of Psychology, University College Dublin (UCD), Belfield, Dublin, Ireland. Electronic address: clara.sherlock@ucdconnect.ie. 3. School of Psychology, University College Dublin (UCD), Belfield, Dublin, Ireland. Electronic address: jessica.bramham@ucd.ie. 4. School of Psychology, University College Dublin (UCD), Belfield, Dublin, Ireland. Electronic address: michelle.downes@ucd.ie.
Abstract
INTRODUCTION: Persistent tic disorders (PTDs) and attention-deficit hyperactivity disorder (ADHD) are common neurodevelopmental conditions which tend to co-occur. Both diagnoses are associated with sleep problems. This systematic review and meta-analysis investigates overlaps and distinctions in objective sleep parameters based on diagnosis (PTD-only, PTD + ADHD, and ADHD-only). METHODS: Databases were searched to identify studies with objective sleep measures in each population. Meta-analyses were conducted using a random effects model. RESULTS: Polysomnography was the only measure included in all three groups. Twenty studies met final inclusion criteria, combining PTD-only (N = 108), PTD + ADHD (N = 79), and ADHD-only (N = 316). Compared to controls (N = 336), PTD-only and PTD + ADHD groups had significantly lower sleep efficiency and higher sleep onset latency. PTD + ADHD also had significantly increased time in bed and total sleep time. No significant differences were observed between ADHD-only groups and controls. DISCUSSION: Different sleep profiles appear to characterise each population. PTD + ADHD was associated with more pronounced differences. Further research is required to elucidate disorder-specific sleep problems, ensuring appropriate identification and monitoring of sleep in clinical settings.
INTRODUCTION: Persistent tic disorders (PTDs) and attention-deficit hyperactivity disorder (ADHD) are common neurodevelopmental conditions which tend to co-occur. Both diagnoses are associated with sleep problems. This systematic review and meta-analysis investigates overlaps and distinctions in objective sleep parameters based on diagnosis (PTD-only, PTD + ADHD, and ADHD-only). METHODS: Databases were searched to identify studies with objective sleep measures in each population. Meta-analyses were conducted using a random effects model. RESULTS: Polysomnography was the only measure included in all three groups. Twenty studies met final inclusion criteria, combining PTD-only (N = 108), PTD + ADHD (N = 79), and ADHD-only (N = 316). Compared to controls (N = 336), PTD-only and PTD + ADHD groups had significantly lower sleep efficiency and higher sleep onset latency. PTD + ADHD also had significantly increased time in bed and total sleep time. No significant differences were observed between ADHD-only groups and controls. DISCUSSION: Different sleep profiles appear to characterise each population. PTD + ADHD was associated with more pronounced differences. Further research is required to elucidate disorder-specific sleep problems, ensuring appropriate identification and monitoring of sleep in clinical settings.