Let sleep burn away brain fog, from the March 2014 Harvard Health Letter

Struggling with fuzzy thinking and a faltering memory? Try this rejuvenating and risk-free approach—sleeping more—to help burn away brain fog, reports the March 2014 Harvard Health Letter.

"Poor sleep has an adverse impact on thinking," says sleep expert Dr. Lawrence Epstein, an instructor in medicine at Harvard Medical School. "This is true whether it's due to a lack of sleep or a sleep disorder."

Lack of sleep can interfere with attention, concentration, and reaction time. Going without sleep for 48 hours harms thinking skills as much as a blood alcohol concentration of 0.1%, which is above the legal limit for driving in every state.

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