Sleeping in Total Darkness Is Good for Your Heart. Here’s Why

Exposure to light during sleep is associated with an increased risk of cardiovascular disease, according to a new study. During sleep, ambient light causes brain stress that is known to result in arterial inflammation, often leading to heart attack and stroke.

Sponsored by The 7 Best Medicare Advantage Plans: What to know before you enroll Choosing the right plan can be confusing. Here are the top-rated plans for 2025, what's changing for 2026, and how to find the coverage that fits your needs. November 18, 2025   TODAY'S TOP STORY Sleeping in Total Darkness Is Good for Your Heart. Here's Why READ ON   Moderate Intensity Exercise: What Counts, Benefits, and More READ ON   6 Types of Creatine and How to Choose the Best Option READ ON   What's the Link Between Myelodysplastic Syndromes and Autoimmune Disorders? READ ON MORE STORIES       Sponsored Check for Micronutrient Deficiencies with Labcorp OnDemand Find out if you're low in key vitamins and minerals with a Micronutrient Test. Get 10% off when you use code HEALTHLINE. SHOP NOW         TODAY'S RESOURCE Sleep Well Newsletter   Learn how to sleep well every night so that you can wake up refreshed and rested. SIGN UP NOW What we're reading next • 5 Delicious Recipes for Easy Digestion • 6 Types of Creatine and How to Choose the Best Option • BlueChew vs. Roman: Which Is Better for ED for 2026? • How to Inject Cosentyx FOLLOW US ON INSTAGRAM We'd love to hear from you! Send us a message at newsletters@healthline.com to let us know what else you'd like to see. Until then, Take care of yourself, and we'll see you again soon! View in browser Did a friend send you this email? Subscribe here. To see all newsletters, click here. Privacy   |   Unsubscribe We may feature your messages to our inbox within our content. Please do not provide any personal identifiable information. Replies may be edited for length and clarity. For more, see our Privacy Policy. Our website services, content, and products are for informational purposes only. Healthline does not provide medical advice, diagnosis, or treatment and should not be used as a substitute for medical advice from a healthcare professional. Healthline encourages you to make any treatment decisions with your healthcare professional. Every product we recommend has gone through either Healthline's or Optum Now's vetting processes. If you buy through links on this page, we may receive a small commission or other tangible benefit. Healthline has sole editorial control over this newsletter. Potential uses for the products listed here are not health claims made by the manufacturers. Healthline and Optum Now are owned by RVO Health. © 2025 RVO Health 1101 Red Ventures Drive Fort Mill, SC 29707