A new study from the CARDIA cohort followed 589 people with an average age of 40.4 years—53% of them women—to see how their sleep habits affected their brains 15 years later. The results are clear:
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Those with 2–3 poor sleep characteristics had brains that aged 1.6 years faster.
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Those with more than 3 poor sleep traits showed brains 2.6 years older.
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Bad sleep quality, difficulty falling or staying asleep, and early morning waking were the biggest culprits.
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The more persistent the sleep issues, the worse the brain aging.
Here’s what they tracked:
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Sleep duration
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Sleep quality (SQ)
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Difficulty initiating sleep (DIS)
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Difficulty maintaining sleep (DMS)
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Early morning awakening (EMA)
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Daytime sleepiness
When these issues persisted over 5 years, brain MRI scans later in life showed significantly more aging-related atrophy.
The takeaway? Sleep isn’t just for energy—it’s critical for your brain’s long-term health.
If you’re tossing and turning, your brain might be paying the price years from now.
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