If you mean like listening to those tapes, then it is possible, but not a very efficient means of doing it.  I had a CD on expanding your vocabulary, and i remember that i had dreams about the words i was learning.  For example, if the word was 'salutation', i would have a dream similar to what the definition and examples of it were.  Whether you remember all the words when waking up is debatable, but some i did remember... i suspect you wouldn't learn a single CD of all 20 words in a single night, but after repeated use, you probably would.