The Model Health Show The #1 Thing That Destroys Your Sleep Quality
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Feb 25, 2026 They dig into how the body’s circadian timing system controls hormones, metabolism, sleep, and cognition. They call out evening use of light-emitting devices as the biggest modern disruptor of sleep. They explain light-dark entrainment, blue light effects, and social jetlag. They offer three practical tactics: screen curfews, blue-blocking glasses, and morning sunlight routines.
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Social Jet Lag Links To Obesity
- Social jet lag — mismatch between internal clocks and social schedules — consistently associates with increased BMI and fat measures.
- Shawn Stevenson cites a meta-analysis of 43 studies with over 200,000 people linking sleep timing variation to obesity.
Irregular Sleep Timing Degrades Sleep Quality
- Frequent changes to sleep timing worsen how fast you fall asleep and sleep consolidation even when total sleep seems adequate.
- Shawn Stevenson references Harvard research showing acute schedule changes impair sleep efficiency.
Even Room Light Strongly Suppresses Melatonin
- Evening exposure to standard room light significantly suppresses melatonin and delays its release in 99% of subjects.
- Shawn Stevenson reviews a Journal of Clinical Endocrinology and Metabolism study with 100+ participants comparing dim versus room light before bed.