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Updated: Jun 13, 2025

Polygraphic Recording Procedure for Measuring Sleep in Mice
Published on: January 25, 2016
[Causal relationship between sleep phenotype and idiopathic normal pressure hydrocephalus: a two-sample bidirectional
1Department of Pediatric Neurosurgery, Center of Neurosurgery, Zhujiang Hospital, Southern Medical University//Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration//The National Key Clinical Specialty//The Engineering Technology Research Center of Education Ministry of China, Guangzhou 510282, China.
Objective:
To explore the causal relationship between sleep phenotype and idiopathic normal pressure hydrocephalus (iNPH) using two-sample bidirectional Mendelian randomization.
Methods:
The exposure data including 8 sleep phenotypes used in this study were obtained from GWAS catalog, FinnGenR10 and MRCIEU GWAS. The outcome data for idiopathic normal-pressure hydrocephalus were obtained from FinnGen R10. We used the inverse-variance weighted (IVW) method to perform the principal analyses. Cochrane Q-statistics test was used to assess the heterogeneity and MR Egger‑intercept test performed to evaluate the pleiotropy for sensitivity analyses.
Results:
IVW result showed that frequent daytime nap was associated with higher odds of iNPH (OR=3.3393, 95 CI% : 1.0646-10.4742, P=0.0270). Cochrane Q-statistics test and MR Egger‑intercept test showed that the MR analysis had no pleiotropy or heterogeneity (P > 0.05). The external validation reproduced this result (OR=2.5660, 95 CI% : 1.1680-5.6373, P=0.0189; OR=4.0424, 95 CI% : 1.5709-10.4024, P=0.0038). Reverse Mendelian randomization suggested that iNPH did not have significant impact on sleep phenotype.
Conclusion:
The frequency of daytime naps is causally associated with iNPH, and reducing the frequency of weekly daytime naps can reduce the risk of iNPH in the elderly population.
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