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Light exposure during sleep impairs cardiometabolic function
Light exposure during sleep may harm heart and metabolism health
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Abstract
One night of moderate (100 lx) light exposure during sleep increases nighttime heart rate and next-morning insulin resistance in healthy adults.
- Nighttime exposure to moderate light is associated with a decrease in heart rate variability, indicating higher sympathovagal balance.
- Increased sympathovagal balance correlates positively with higher insulin levels.
- Sleep in a dimly lit environment (<3 lx) does not produce the same adverse effects on heart rate and insulin resistance.
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Key numbers
15%
Increase in Insulin Resistance
Change in from Day 1 to Day 2 in the room light condition.
30 min
Higher Insulin Levels
Time point of higher insulin levels during OGTT in the room light condition.
significant
Heart Rate Increase
Change in heart rate during sleep in the room light condition.