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Light exposure during sleep impairs cardiometabolic function.

Ivy C Mason1,2,3, Daniela Grimaldi1, Kathryn J Reid1

  • 1Center for Circadian and Sleep Medicine, Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 2022
PubMed
Summary
This summary is machine-generated.

Exposure to moderate nighttime light during sleep increases heart rate and insulin resistance in healthy adults. Sympathetic nervous system activation may explain these adverse cardiometabolic effects.

Keywords:
insulin resistancelightmetabolismsleepsympathetic nervous system

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Area of Science:

  • Cardiovascular physiology
  • Metabolic health
  • Sleep science

Background:

  • Ambient nighttime light exposure is linked to adverse health outcomes, including cardiometabolic disease.
  • The precise impact of sleep light exposure on cardiometabolic health and its underlying mechanisms remain incompletely understood.

Purpose of the Study:

  • To investigate the effects of moderate nighttime light exposure during sleep on cardiometabolic parameters in healthy adults.
  • To explore the potential role of sympathovagal balance in mediating light-induced cardiometabolic changes.

Main Methods:

  • Healthy adults underwent one night of sleep in a laboratory setting under two conditions: moderate light (100 lx) and dim light (<3 lx).
  • Nighttime heart rate, heart rate variability, and next-morning insulin resistance were assessed.
  • The relationship between sympathovagal balance and insulin levels was analyzed.

Main Results:

  • Moderate light exposure during sleep significantly increased nighttime heart rate compared to dim light conditions.
  • Heart rate variability decreased, indicating higher sympathovagal balance, under moderate light exposure.
  • Next-morning insulin resistance was elevated following sleep in moderate light compared to dim light.

Conclusions:

  • Even one night of moderate light exposure during sleep can negatively impact cardiometabolic health in healthy adults.
  • Increased sympathetic nervous system activity, reflected by higher sympathovagal balance, may contribute to light-induced insulin resistance.
  • These findings highlight the importance of minimizing light exposure during sleep for maintaining cardiometabolic well-being.