A refreshing night's sleep may be the best way to boost memory, a study suggests.

Researchers found sleep appears to have a dramatic impact on the way the brain functions the next day.

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Dr Stanley said: "Sleep is not just a waste of time, it is a very active time and we need it for things like memory and learning.

"During the day we acquire information, but at night we sort that information.

"People complain about sleep deprivation, but now with the 24/7 society and information overload we need our sleep more than ever."