Too often our memory starts acting like a particularly porous sieve: all the important fragments that should be caught and preserved somehow just disappear. So armed with pencils and bolstered by caffeine, legions of adults, especially older adults, tackle crossword puzzles, acrostics, Sudoku and a host of other activities designed to strengthen their flagging memory muscles. But maybe all they really need to do to cement new learning is to sit and close their eyes for a few minutes. In an article to be published in the journal Psychological Science, a publication of the Association for Psychological Science, psychological scientist Michaela Dewar and her colleagues show that memory can be boosted by taking a brief wakeful rest after learning something verbally new -- so keep the pencil for phone numbers- and that memory lasts not just immediately but over a longer term.