A NY Times article says that a new study has shown that playing certain sounds while you are sleeping can help you to remember things you studied before you went to sleep. While I have always been skeptical about theories such as these, this study seems to be onto something.
The idea in this theory is that sound cues during your sleep help you to rehearse ideas you learned during the day. This rehearsal helps you to remember more.
Although this study seems legitimate, some sleep experts are still not convinced due to the lack of evidence. The study was fairly elementary, for example, showing participants a picture of a cat and having a cat meowing in their sleep. While playing sounds during sleep may not help your memory for all topics, this could be helpful with memorizing some things. A greater variety of research on this topic will help us to learn more.
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