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How brain cells lift mood in the sleepless.

Neuroscientists have discovered an interesting biological link between depression and sleep.

Researchers from Tufts University determined star-shaped brain cells, called astrocytes, may be responsible for the rapid improvement in mood in depressed patients after acute sleep deprivation.

Investigators believe the findings may lead to the development of effective and fast-acting drugs to treat depression, particularly in psychiatric emergencies.

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