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Nocturnal sleep disturbances are associated with the severity of objective excessive daytime sleepiness in children and adolescents with narcolepsy type 1.

In a cross-sectional study of 114 children and adolescents with NT1, those with more severe daytime sleepiness (shorter mean sleep latency on MSLT) had progressively shorter nocturnal sleep latency, higher N1 sleep proportion, lower nocturnal oxygen saturation, and shorter mean REM sleep latency. Generalized linear models identified shorter nocturnal sleep latency, longer N1 sleep duration, higher arousal index, and higher periodic limb movements index as factors associated with shorter MSL.

Last updated: Jul 14, 2026โ€ข0 RCTsโ€ข๐Ÿ“– Read as article โ†’

Evidence Score

Evidence Score34/100
Human RCTโ˜†โ˜†โ˜†โ˜†โ˜†
Meta-analysisโ˜†โ˜†โ˜†โ˜†โ˜†
Mechanismโ˜…โ˜…โ˜…โ˜…โ˜…
Safetyโ˜…โ˜…โ˜…โ˜…โ˜†
Confidencelow

Study Evidence

Study 1. [Analysis of clinical characteristics and risk factors in children and adolescents with narcolepsy type 1 across different severities of daytime sleepiness].

observational

Wu Q, Zhang LP, Yang YQ, Su CJ, Zhao XC ยท Zhonghua yi xue za zhi (2026)

Participants: N/A
Duration: N/A (cross-sectional, retrospective data from 2015-2025)
Intervention: No intervention; observational study comparing groups based on severity of objective EDS (MSL quartiles).
Outcome: Mean sleep latency (MSL) on multiple sleep latency test (MSLT), mean REM sleep latency (MRL), nocturnal polysomnography parameters (sleep latency, N1 sleep proportion, lowest oxygen saturation, arousal index, periodic limb movements index).
Effect Size: N/A (beta coefficients reported: nocturnal SL ฮฒ=0.08, P<0.001; N1 duration ฮฒ=-0.01, P=0.022; arousal index ฮฒ=-0.08, P=0.003; PLMI ฮฒ=-0.27, P=0.024).
Population: 114 children and adolescents (age <18 years) diagnosed with narcolepsy type 1 at Tangdu Hospital, Fourth Military Medical University, from January 2015 to January 2025.

Result:

PubMed: 42402881DOI: 10.3760/cma.j.cn112137-20260209-00426

Mechanism Graph

Nocturnal sleep fragmentation (shorter SL, higher arousal index) disrupts sleep continuity.
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Increased N1 sleep and periodic limb movements indicate unstable nocturnal sleep.
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Lower nocturnal oxygen saturation suggests possible respiratory-related sleep disruption.
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These nocturnal disturbances contribute to greater objective daytime sleepiness (shorter MSL).

Limitations

  • โš Cross-sectional design prevents causal inference.
  • โš Single-center retrospective study with relatively small sample size (n=114).
  • โš No control group of healthy children or adults for comparison.

Frequently Asked Questions

What is the main finding of this study?โ–ผ

The severity of objective daytime sleepiness in children with narcolepsy type 1 is linked to nocturnal sleep disturbances, such as shorter sleep latency, more N1 sleep, higher arousal index, and periodic limb movements.

How was daytime sleepiness measured?โ–ผ

Daytime sleepiness was measured objectively using the mean sleep latency (MSL) from the multiple sleep latency test (MSLT), with patients divided into mild, moderate, and severe groups based on MSL quartiles.

Did the Epworth Sleepiness Scale correlate with objective sleepiness?โ–ผ

No, the study found no significant correlation between Epworth Sleepiness Scale scores and objective MSL (ฯ=-0.099, P=0.299).

What nocturnal factors were associated with shorter MSL?โ–ผ

Shorter nocturnal sleep latency, longer N1 sleep duration, higher arousal index, and higher periodic limb movements index were all associated with shorter MSL in generalized linear models.

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References

  1. 1.Wu Q, Zhang LP, Yang YQ, Su CJ, Zhao XC. "[Analysis of clinical characteristics and risk factors in children and adolescents with narcolepsy type 1 across different severities of daytime sleepiness].." Zhonghua yi xue za zhi, 2026. PMID: 42402881 DOI: 10.3760/cma.j.cn112137-20260209-00426
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