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The Diary of a CEO with Steven Bartlett · May 15, 2026 · 40m
Most Replayed Moment: The Link Between Weight Gain and Sleep! Are Sleep Trackers Harmful Or Helpful?
Dr. Guy Leschziner, a consultant neurologist and sleep physician, explores how sleep deprivation cascades through your body—disrupting appetite regulation, driving weight gain, and destabilizing emotions. He explains what your circadian rhythm actually controls and shares his evidence-based verdict on sleep trackers: whether they help or harm your sleep quality.
This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.
Curious
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Getting 8 hours of fragmented, light sleep is not equivalent to 6 hours of continuous, stage-cycling sleep; the architecture of your sleep cycles determines restorative benefit.
Highlights
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Poor sleep dysregulates leptin, the satiety hormone, making your body unable to register fullness even when calorie intake is adequate.
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Your body's internal clock doesn't just regulate sleep timing; it orchestrates metabolism, appetite, immune function, and emotional regulation across 24 hours.
Editorial
References
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Why We Sleep — Matthew Walker — Referenced as foundational sleep science
Misc
✧Leschziner emphasizes circadian rhythm as the master controller of metabolism, not just sleep timing
✧Sleep trackers create a paradox: data collection can increase sleep anxiety rather than improve sleep
✧Poor sleep triggers leptin dysregulation—your body literally loses the signal to feel full
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