Editing Sleep-learning (section)

==History==
In 1927, [[Alois Benjamin Saliger]] invented the "Psycho-Phone" or "Psychophone", a specialized version of [[Thomas Edison]]'s [[phonograph]], for sleep learning, stating: "It has been proven that natural sleep is identical with hypnotic sleep and that during natural sleep the unconscious mind is most receptive to suggestions."<ref>{{cite news |title=Psycho-Phone |url=https://books.google.com/books?id=DlUQAAAAIAAJ&q=Saliger+psycho-phone |quote=Well, sir, since 1927, Mr. Saliger has sold more than 2500 Psycho-phones ... |magazine=[[The New Yorker]] |year=1933 |accessdate=2010-11-18 }}</ref> Saliger patented the device in 1932 as the "automatic time-controlled suggestion machine".<ref>{{cite web |last1=Wright |first1=Gwen |title=PsychoPhone |url=https://www.pbs.org/opb/historydetectives/investigation/psychophone/index.html |website=History Detectives: Special Investigations |publisher=Public Broadcasting Service (PBS) |access-date=12 February 2025}}</ref><ref>{{cite news |last1=Benjamin |first1=Ludy T. |title=The Psycho-Phone |url=https://centerhistorypsychology.wordpress.com/2017/02/23/the-psycho-phone/ |access-date=12 February 2025 |work=Cummings Center Blog |agency=Center for the History of Psychology |publisher=University of Akron |date=23 February 2017}}</ref>

Since the [[electroencephalography]] studies by Charles W. Simon and William H. Emmons in 1956, learning by sleep has not been taken seriously. The researchers concluded that learning during sleep was "impractical and probably impossible". They reported that stimulus material presented during sleep was not recalled later when the subject awoke, unless [[alpha wave]] activity occurred at the same time the stimulus material was given.<ref name = "hyp">{{cite book| last =Fromm| first =Erika| author2 =Ronald E. Shor| year =1972| title =Hypnosis| url =https://books.google.com/books?id=1dR6rGvVCOIC&q=hypnop%C3%A6dia&pg=PA78| publisher =Aldine/Atherton| id =020230856| isbn =978-0-202-30856-2}} p. 78  Referring to Charles W. Simon and William H. Emmons [http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0604651 EEG, Consciousness, and Sleep] {{Webarchive|url=https://web.archive.org/web/20160417184650/http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0604651 |date=2016-04-17 }}, ''Science'', 1956, 124, 1066–1069.</ref><ref name = "wake">{{cite book| last =Kleitman | first =Nathaniel  | year =1987| title = Sleep and Wakefulness| url = https://books.google.com/books?id=FwKzKM4sdEoC&q=%22sleep+learning%22&pg=PA725| publisher = University of Chicago Press| isbn = 0-226-44073-7}} p. 125.</ref>