How sleep cleanses the brain

Researchers find 'waves of cerebrospinal fluid' may be washing the brain

During deep sleep, the brain may be removing the detritus that accumulates during a hard day of thinking, US researchers say.

Cleaning products

Researchers have found that during slow-wave sleep, cerebrospinal fluid (CSF) pulses into the brain, taking out the garbage as it recedes, according to a report published in Science.

Using high-speed brain imaging, the researchers mapped the series of events that occur as the brain enters deep sleep and brain waves start to slow and synchronise.

They found that the blood