You can increase foreign vocabulary by sleep learning

Although sleeping time is a relaxing time of healing, it is being studied "sleep learning" from the idea of "can not make sleep more productive?" Sleep learning is often said to set memory at awake, but apart from that, research shows that language learning at sleep is useful.

Learning new vocabulary during deep sleep - University of Bern
https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2019/medienmitteilungen_2019/learning_new_vocabulary_during_deep_sleep/index_eng.html

Implicit Vocabulary Learning during Sleep Is Bound to Slow-Wave Peaks: Current Biology
https://www.cell.com/current-biology/fulltext/S0960-9822(18)31672-5

Conventional sleep research focuses on stabilizing and strengthening memory during awake, and learning during sleep was rarely a research theme. Meanwhile, researchers at the University of Bern in Switzerland can learn the vocabulary of a new language at the stage of slow wave sleep, which is a deep sleeping state of non-REM sleep, and that the vocabulary learned during sleep can be unconsciously searched after awakening I showed it through research.

If sleep can improve the memories at awake, the brain processing to input new information for the first time should also be feasible during sleep, researchers at the psychology laboratory and the university of Bern I thought about international collaboration. Studies have made it possible to strengthen weak memory and embed newly acquired information in existing knowledge by playing back speech of language learning during sleep. The results of this experiment are open to the scientific journal " Current Biology " with open access.

During a deep sleep, the brain cells alternately display an active state called "up state" and an inactive state called "down state" about every 0.5 seconds. The research group investigated whether the sleeping person can form a semantic relation between the foreign language and the translated word by the sound reproduced during the "up state".

by Simon Evans

According to the research, when I played the word of artificial language and its translation word during sleep, I was able to grasp only the rough association. For example, when a sleeping person listens to the word pair "tofer = key" and "guga = elephant", after waking up they could not translate the exact meaning of the word, "tofer Researchers say that "small things" "guga is a big thing" could be classified as "higher probability of accuracy than by chance".

In the paper, it is important that the brain associates when a translation word in a pair, that is, a word corresponding to "key" in "tofer = key" is reproduced during the "up state" of the sleep cycle I claim it is possible. Dr. Marc Züst, a neuropsychologist at the University of Bern, says, "Human beings can do sophisticated information processing without consciousness.The memory at sleep I think you never saw that word before. Nonetheless, I can influence how you react to foreign languages. "