Deep sleep takes out trash from brain: study – Xinhua | English.news.cn – Xinhua

CHICAGO, Jan. 21 (Xinhua) — By examining fruit flies’ brain activity and behavior, researchers at Northwestern University (NU) found that deep sleep has an ancient, restorative power to clear waste from the brain.
In the study, the researchers examined proboscis extension sleep, a deep-sleep stage in fruit flies, which is similar to deep, slow-wave sleep in humans. They discovered that, during this stage, fruit flies repeatedly extend and retract their proboscis or snout.
“This pumping motion moves…

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