Wearing an eye mask during sleep could boost your memory and alertness next day, according to a study by Cardiff University.
More than 100 people underwent learning and memory tests after a week of sleeping with a mask on, followed by a week without one.
The results, published in December in the journal Sleep, showed that the participants scored better after wearing the mask.
Scientists think blocking out light at night improves sleep quality (by reducing disturbance from light), which in turn helps brain function during waking hours.
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