Some companies *claim* they have products that do so. Even some have software that generate "subliminal" sound messages and wrap them in some noise. But I think (this is not based on research or scientific knowledge) that it's all a scrap! Things do not go this way. Turn your tape/CD player on, go to sleep (as they claim) and in the morning, your give a speech in japanese!!!
If anyone has some scientific eveidence for this, plz let me know (although I this is not the place for that)
