Why Can’t You Sleep After Looking at Your Phone? The Science of Blue Light & Your Eyes
Did you know your eyes have a third type of photoreceptor that doesn’t even help you see—but instead controls your sleep and body clock?
In this video, Dr. Keshav Narain, board-certified ophthalmologist and founder of South Bay Retina, explains how intrinsically photosensitive retinal ganglion cells (ipRGCs) work, why they react strongly to blue light, and how nighttime screen use may be silently sabotaging your health.
✅ The discovery of ipRGCs and how they differ from rods and cones
✅ Why blue light exposure at night suppresses melatonin and delays sleep
✅ The hidden health risks of long-term circadian disruption (metabolism, heart health, mood, cancer risk)
✅ Simple steps to protect your eyes and restore healthy sleep cycles
Protecting your circadian rhythm isn’t just about sleep—it’s about safeguarding your long-term vision and overall health.
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𝗦𝘁𝗮𝘆 𝗖𝗼𝗻𝗻𝗲𝗰𝘁𝗲𝗱 𝘄𝗶𝘁𝗵 𝗗𝗿. 𝗞𝗲𝘀𝗵𝗮𝘃 𝗡𝗮𝗿𝗮𝗶𝗻 & 𝗦𝗼𝘂𝘁𝗵 𝗕𝗮𝘆 𝗥𝗲𝘁𝗶𝗻𝗮:
𝗪𝗲𝗯𝘀𝗶𝘁𝗲: https://www.southbayretina.com
𝗣𝗵𝗼𝗻𝗲: (408) 294-3534
𝗦𝗲𝗿𝘃𝗶𝗻𝗴 𝗦𝗮𝗻 𝗝𝗼𝘀𝗲, 𝗖𝘂𝗽𝗲𝗿𝘁𝗶𝗻𝗼, 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗴𝗿𝗲𝗮𝘁𝗲𝗿 𝗦𝗼𝘂𝘁𝗵 𝗕𝗮𝘆 𝗔𝗿𝗲𝗮
𝗬𝗼𝘂𝗧𝘂𝗯𝗲: youtube.com/@NarainEye
𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺: https://www.instagram.com/south_bay_retina
𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸: https://www.facebook.com/narain1
𝗧𝗶𝗸𝗧𝗼𝗸: https://www.tiktok.com/@southbayretina
𝗣𝗼𝗱𝗯𝗲𝗮𝗻: https://southbayretinamedia.podbean.com/
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𝗔𝗯𝗼𝘂𝘁 𝗗𝗿. 𝗞𝗲𝘀𝗵𝗮𝘃 𝗡𝗮𝗿𝗮𝗶𝗻
Dr. Narain is a fellowship-trained retinal specialist with over 20 years of experience. As the founder of South Bay Retina, he combines advanced retinal care with a passion for patient education—helping people protect both their vision and overall health.
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𝗗𝗶𝘀𝗰𝗹𝗮𝗶𝗺𝗲𝗿
This video is for educational purposes only and should not be considered medical advice. If you are experiencing sudden flashes, floaters, or changes in vision, please seek care from an eye doctor immediately. Always consult your physician for personalized medical guidance.
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