Related Experiment Video
Updated: Jun 19, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
Published on: December 6, 2016
Sleep stage dynamics differ between children with and without obstructive sleep apnea
Ronald D Chervin1, Judith L Fetterolf, Deborah L Ruzicka
1Sleep Disorders Center and Department of Neurology, University ofMichigan, Ann Arbor, MI 48109-0845, USA. chervin@umich.edu
Insights
Sleep stage durations in children often follow exponential distributions. Mean stage 2 sleep duration is a key indicator differentiating children with and without sleep disordered breathing (SDB).
Area of Science:
- Pediatric Sleep Medicine
- Sleep Physiology
- Respiratory Medicine
Background:
- Sleep dynamics, including sleep stage durations, exhibit exponential distributions in adults.
- The clinical utility of these sleep dynamics in children, particularly concerning sleep disordered breathing (SDB), remains underexplored.
Purpose of the Study:
- To investigate sleep stage durations and their distributions in children with and without SDB.
- To determine if these sleep dynamics can serve as clinical markers for childhood SDB.
Main Methods:
- Analysis of polysomnographic data from the Washtenaw County Adenotonsillectomy Cohort.
- Inclusion of 48 children (5-12 years) with SDB and 20 age-matched controls.
- Data collected at baseline and one-year follow-up.
Main Results:
- Sleep and sleep stage durations generally followed exponential distributions in children.
- At baseline, several sleep variables, including mean stage 2 duration, differentiated SDB from control groups.
- Mean stage 2 duration independently distinguished SDB, persisting at one-year follow-up.
Conclusions:
- Sleep stage durations in children, with or without SDB, appear to follow exponential distributions.
- Mean stage 2 sleep duration is a potentially valuable parameter for analyzing childhood SDB, complementing standard polysomnography.
Study Objectives:
Analysis of sleep dynamics--distributions of contiguous sleep and sleep stage durations--reveal exponential distributions and potential clinical utility in adults. We sought to examine these polysomnographic variables for the first time in children, and in the context of childhood sleep disordered breathing (SDB).
Design And Setting:
Analysis of polysomnographic data available from the Washtenaw County Adenotonsillectomy Cohort.
Participants:
Selected subjects were 48 children aged 5-12 years with SDB (pediatric apnea/hypopnea index > or = 1.5) who were scheduled for adenotonsillectomy and 20 control subjects of similar ages without SDB. Subjects were studied at enrollment and again one year later in almost all cases.
Results:
Durations of sleep and specific sleep stage bouts generally followed exponential distributions. At baseline, the number of sleep stage changes, proportion of total sleep time occupied by stage 1 sleep, proportion stage 2 sleep, mean stage 2 duration, and mean stage REM duration each distinguished subjects with and without SDB (P < 0.05), but only mean stage 2 duration did so independently after accounting for the other variables (P = 0.03). At one-year follow-up, changes in total sleep time, mean stage 2 duration, and mean stage REM duration distinguished SDB from control subjects, but again only changes in mean stage 2 duration did so independently (P = 0.01).
Conclusions:
Durations of uninterrupted sleep and specific sleep stages appear to follow exponential distributions in children with or without SDB. Parameters that describe these distributions--particularly mean duration of stage 2 sleep periods--may provide useful additions to standard sleep stage analyses.
Related Concept Videos
Sleep Apnea
The condition is more prevalent among...
Stages of Sleep
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Nightmares and Night Terrors
Nightmares often...
Psychosexual Stages of Personality: Latency
The latency period is not considered...
Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption
