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Sleep: Caretaker of memories, repairer of prejudice
Sleep: Caretaker of memories, repairer of prejudice

Learning new stuff takes sleep. Robbed of the restorative balm of slumber, research demonstrates that the human brain will quickly lose its ability to make and hold on to new memories, and learning takes a dive. A new study, however, finds that sleep is also crucial to unlearning stuff that we may have committed to memory without a proper quality-control check. Implicit biases -- those stereotypes about gender, race, age and ethnicity that you might never own up to but which nevertheless color your reactions to people and situations -- are laid down early, and they are surprisingly hard to break. In a study published Thursday in Science, psychologists from Northwestern...

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