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Daytime napping is associated with retinal microcirculation: a large population-based study in China.

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  • 1Eye Center, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.

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Regular daytime napping, especially for 0.5-1 hour, is linked to better retinal microcirculation indicators. This association may be independent of vascular diseases, suggesting a potential protective role for short naps.

Keywords:
arterio-to-venous ratiocentral retinal arteriolar equivalentdaytime nappingretinal microcirculation

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Area of Science:

  • Ophthalmology and vascular health research.
  • Investigating the impact of lifestyle factors on ocular health.

Background:

  • Retinal microcirculation is a key indicator of overall vascular health.
  • Daytime napping is a common behavior with potential health implications.
  • Understanding the relationship between napping and retinal vascular parameters is important for preventative health.

Purpose of the Study:

  • To examine the association between daytime napping duration and retinal microcirculation.
  • To determine if napping duration influences retinal vascular calibers (RVCs) like central retinal arteriolar equivalent (CRAE), central retinal venular equivalent (CRVE), and arterio-to-venous ratio (AVR).

Main Methods:

  • Cross-sectional study of 2,662 participants from a prospective population-based cohort.
  • Napping habits assessed via face-to-face interviews; RVCs measured using fundus photography.
  • Multivariate regression and restricted cubic spline analyses used to evaluate associations.

Main Results:

  • 56.4% of participants reported regular daytime napping.
  • Napping for 0.5-1 hour was significantly associated with wider CRAE (4.18 µm increase, p < 0.001).
  • 0.5-1 hour naps correlated with a lower risk of reduced AVR (OR 0.70, p = 0.001), with a J-shaped relationship observed.

Conclusions:

  • A positive association exists between 0.5-1 hour daytime naps and improved retinal microcirculation.
  • The beneficial effects of napping on retinal vasculature may occur independently of diagnosed vascular diseases.
  • Nap duration appears to influence retinal microcirculation in a J-shaped manner.