The hidden risk to your heart from sleeping in low light

Key Points:

• A new study published in the European Heart Journal found that even low levels of light exposure during sleep can thicken heart muscle walls and impair heart function, increasing the risk of future cardiovascular disease.
• Researchers analyzed data from over 11,000 UK Biobank participants, finding that exposure to more than 3 lux of light at night led to cardiac remodeling, including thickening of the left ventricle and reduced heart muscle flexibility.
• Approximately 24% to 49% of the negative heart effects were linked to shorter sleep duration caused by nighttime light exposure, while other factors like stress and biological changes may also contribute to cardiovascular risk.
• Experts recommend minimizing bedroom light exposure by using blackout curtains, turning off hallway lights, using dim red or amber bedside bulbs, and employing sleep masks if necessary to protect heart health and improve sleep quality.
• Some limitations of the study include short monitoring duration and potential inaccuracies in wrist-based light measurement, indicating a need for further research to establish causality between light exposure and heart disease.