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Heart surgeon with 25 years of experience explains how daylight saving time affects your body: ‘That 1 hour change can…’

When daylight saving time ends and clocks shift back an hour, even this small change can disrupt your body’s rhythm, explains Dr London.

Updated on: Nov 11, 2025 09:15 pm IST
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Every year, as winter approaches, many countries turn their clocks back by an hour to mark the end of daylight saving time - a practice originally introduced to make better use of daylight and conserve energy. While this shift may seem small and even welcome for adding an extra hour of rest, experts say it can take a surprising toll on the body. Even a one-hour disruption can throw off the circadian rhythm, making it harder for many people to adjust physically and mentally.

Dr London states that even a one hour shift can disrupt the body's rhythm.(Pixabay)

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Dr Jeremy London, a cardiothoracic surgeon with over 25 years of clinical experience, has shed light on the surprising effects that daylight saving time can have on the human body. In an Instagram video posted on November 10, the cardiac surgeon explains how even a one-hour shift can disrupt the body’s natural rhythm and offers practical tips to help the body adjust smoothly.

How does daylight saving affect your body?

Dr London explains, “Studies show that our internal biology clock is tightly synced to light exposure. When we abruptly change it, sleep quality drops, cortisol rises, and inflammation increases, especially in the spring. Now, some are affected more than others, but none of us are immune.”

How to adjust to daylight saving?

Dr London notes that the American Academy of Sleep Medicine recommends maintaining a permanent standard time, as it aligns more closely with our natural biology and helps reduce potential health risks. But until that happens, the cardiologist suggests ways to adjust accordingly.

He elaborates, “Prioritize consistent sleep, morning sunlight, and mindful breaks. I found that meditation, outdoor walks, and even sauna sessions help me reset after the time change because sleep is king. If your sleep is off, it affects every aspect of your life.”

Note to readers: This article is for informational purposes only and not a substitute for professional medical advice. It is based on user-generated content from social media. HT.com has not independently verified the claims and does not endorse them.

 
ABOUT THE AUTHOR
Eshana Saha

Eshana Saha is a fresh face in lifestyle and cultural journalism, bringing a refined, multidisciplinary perspective to the intersection of entertainment, fashion and holistic wellbeing. With less than a year of professional experience, she has quickly adapted to high-pressure editorial environments and currently works full-time with HT Media. Prior to this, she interned for nearly six months with Hindustan Times’ entertainment and lifestyle vertical, where she gained hands-on experience in digital reporting, trend analysis and editorial storytelling. Based in New Delhi, Eshana specialises in comprehensive coverage of major cultural moments — from international film press tours to the curated aesthetics of global fashion showcases, award shows and music-centred events. She holds a Bachelor’s degree in English from St Xavier’s University, Kolkata, and a Master’s degree in English from the University of Delhi, equipping her with a strong academic foundation and a keen ability to deconstruct complex cultural trends into clear, high-impact narratives. Beyond the red carpet, Eshana has developed a growing focus on health and wellbeing reporting. She bridges the gap between celebrity-driven trends and practical, evidence-informed lifestyle advice, ensuring her work remains both aspirational and grounded in editorial rigour. She has extensively covered the health implications of Delhi’s air pollution crisis, while also playing a key role in amplifying expert-led insights on women’s health and mental wellbeing, helping translate complex medical perspectives into informed, impactful public awareness. An artist at heart, she explores multiple creative forms — from visual arts and music to culinary experiments — and brings a creative’s eye for nuance, texture and detail to every story. Whether analysing runway dynamics or examining emerging wellness movements, she remains committed to accuracy and the highest standards of contemporary journalistic ethics.

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Catch your daily dose of Fashion, Taylor Swift, Health, Festivals, Travel, Relationship, Recipe and all the other Latest Lifestyle News on Hindustan Times Website and APPs.
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