You see an advertisement for a method of learning a foreign language that seems simple-just put on a tape and fall asleep. The accompanying description cites proof that people can learn while asleep. Being a good psychological detective, what question would you ask about the offered proof?

Did the individuals actually dream about the foreign language?

What did the EEG indicate about the participants' level of sleep?

Did the researchers use only long sleepers who would spend more time with the tapes?

Were study breaks included in the tape to provide greater comprehension of the material?