Although sleep is considered an important period for memory consolidation,[1] scientific research has concluded that sleep-learning is not possible.
Once a concept explored in the early history of psychology, sleep-learning appears frequently in fiction and parapsychology, and is widely considered to be pseudoscience.
"[2] Saliger patented the device in 1932 as the "automatic time-controlled suggestion machine".
[3][4] Since the electroencephalography studies by Charles W. Simon and William H. Emmons in 1956, learning by sleep has not been taken seriously.
[7] The following examples are listed chronologically by publication or original air date, when known.