Light Is a Drug

In the first episode of season two, Lyssia sits down with Dr. Mariana Figueiro, director of the Light and Health Research Center at Mount Sinai and one of the leading researchers in light and human health, to explore how light shapes far more than what we see. Originally trained as an architect, Dr. Figueiro has spent her career studying how light affects our circadian rhythms, sleep, mood, alertness, and long-term health, and her work asks a simple, overlooked question: what if the light in your home is quietly working against you?The conversation centers on why Dr. Figueiro describes light almost like a drug. Like medication, she explains, light needs a dose, a timing, and a regularity to work in your favor, and getting the timing wrong can disrupt sleep just as easily as the right timing improves it. They break down what that means in practice: how much light the eye actually needs, why the first hour after waking matters most, and why dimming the hours before bed matters nearly as much as brightening the ones after.Dr. Figueiro also shares what years of applied research have shown, from redesigning lighting aboard US Navy submarines to help sailors sleep and stay alert on shift, to her long-running work in nursing homes, where increasing daytime light improved mood, reduced agitation, and lowered fall rates in patients with Alzheimer's disease. The conversation also pushes back on a few popular assumptions: why blue light glasses and screen filters are often oversold, why a dim room can look bright enough to fool your eyes while doing nothing for your body clock, and why red light seems to work more like a cup of coffee than a sleep aid.By the end of this episode, you may realize that better sleep has less to do with what you do right before bed and more to do with the light you let in hours before you even think about it.More Room to Think: Dr. Mariana Figueiro LinkedIn: https://www.linkedin.com/in/mariana-figueiro-694632150/ Light and Health Research Center at Mount Sinai: https://icahn.mssm.edu/research/light-health LinkedIn: https://www.linkedin.com/company/light-and-health-research-center-mount-sinai/ Facebook: https://www.facebook.com/Light.and.Health.Research.Center.Mount.Sinai X: https://x.com/LightSinai/Room to Think https://roomtothinkpodcast.com/Loved this episode? Let us know!Subscribe to Room to ThinkIf you enjoyed this episode, leave a review and share it with someone who would appreciate a more thoughtful approach to their space. New episodes every week. Build a better life by design.Spotify | Apple Podcasts | YouTube | Instagram