Researchers from two Swiss universities wanted to know if they could enhance the learning of words from a foreign language by exposing people to the words during non-rapid eye movement sleep the deep, dreamless sleep period that most of us experience during the first few hours of the night.
To find out, they gathered two groups of study participants, all of whom were native German speakers, and gave them a series of Dutch-to-German word pairs to learn at 10 pm. One group was then instructed to get some sleep, while the other group was kept awake.For the next few hours both groups listened to an audio playback of the word pairs they’d already been exposed to and some they hadn’t yet heard.
The researchers then re-gathered both groups at 2 am and gave them a test of the Dutch words to uncover any differences in learning. And indeed there was a difference.
