Science has never given much credence to claims that you can
learn Chinese or French by having the instruction CDs play while
you sleep. If any learning happens that way, most scientists
say, the language lesson is probably waking the sleeper up, not
causing nouns and verbs to seep into a sound-asleep mind.    In
a study published online Thursday by the journal Science,
researchers taught people to move 50 pictures to their correct
locations on a computer screen. Each picture was accompanied by
a related sound, like a meow for a cat and whirring for a
helicopter.   ''We were able to cue people to specific
information they had learned,'' said Ken A. Paller, a cognitive
neuroscientist at Northwestern and co-author of the study. ''The
thinking is that during sleep, memory consolidation is going on
and that rehearsal is a good way to strengthen memories.    A
2007 study found that people who were given whiffs of rose scent
as they learned a task remembered the task better when they also
inhaled rose scent while s