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[1] It turns out that nodding off（打盹) in class may not be such a bad idea after all, as a new study has shown that going to sleep shortly after learning new material is the best way to remember it .According to U.S lead author, Jessica Payne, a psychologist at the University of Notre Dame in Indiana, nodding off after learning something is like “telling’’ the sleeping brain what to remember.
[2] Along with colleagues, she studied 207 students who used to sleep for at least six hours per night. The students were asked to study declarative, semantically related or unrelated word pairs, at 9 am or 9 pm, and returning for
