Nutrition Facts with Dr. Greger

How Much Sleep Is Enough?

31 snips
Jul 3, 2025
Delve into the intriguing science behind sleep and its critical role in health. Discover the effects of melatonin on aging and how supplements stack up against natural production. Learn if six hours of sleep is truly sufficient and uncover the importance of adequate sleep for the brain's cleaning mechanisms. This discussion blends fascinating research with practical insights for better sleep hygiene.
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INSIGHT

Melatonin Supplements' Limited Effect

  • Melatonin supplements produce minimal sleep benefits, only speeding sleep onset by 4 minutes on average.
  • High doses can be unsafe, and supplement content varies wildly, raising authenticity concerns.
INSIGHT

Gut: Major Melatonin Source

  • Most melatonin in the body comes from the gut and GI tract, not the pineal gland.
  • Certain foods and magnesium supplements may increase blood melatonin by releasing it from this reservoir.
ADVICE

Sleep At Least 7 Hours

  • Aim for at least 7 hours of regular sleep nightly for optimal health and longevity.
  • Both short and excessive sleep durations are linked to higher risks of disease and death.
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