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Sleep-learning or sleep-teaching (also known as hypnopædia or hypnopedia) is an attempt to convey information to a sleeping person, typically by playing a sound recording to them while they sleep. Although sleep is considered an important period for memory consolidation , [ 1 ] scientific research has concluded that sleep-learning is not possible.
NREM sleep itself is divided into multiple stages – N1, N2 and N3. Sleep proceeds in 90-minute cycles of REM and NREM, the order normally being N1 → N2 → N3 → N2 → REM. As humans fall asleep, body activity slows down. Body temperature, heart rate, breathing rate, and energy use all decrease. Brain waves slow down.
The development of concepts, beliefs and practices related to hypnosis and hypnotherapy have been documented since prehistoric to modern times.. Although often viewed as one continuous history, the term hypnosis was coined in the 1880s in France, some twenty years after the death of James Braid, who had adopted the term hypnotism in 1841.
The same tale was told in the earlier 12th century work “Disciplina Clericalis,” and even became part of the 17th century book “Don Quixote” — only in this version Quixote’s squire ...
During pre-industrial Europe, biphasic (bimodal) sleeping was considered the norm. Sleep onset was determined not by a set bedtime, but by whether there were things to do. [143] The boundaries between sleeping and waking are blurred in these societies.
During a normal night of sleep, a person will alternate between periods of NREM and REM sleep. Each cycle is approximately 90 minutes long, containing a 20-30 minute bout of REM sleep. [7] NREM sleep consists of sleep stages 1–4, and is where movement can be observed. A person can still move their body when they are in NREM sleep.
Training in sleep medicine is multidisciplinary, and the present structure was chosen to encourage a multidisciplinary approach to diagnosis. Sleep disorders often do not fit neatly into traditional classification; differential diagnoses cross medical systems. Minor revisions and updates to the ICSD were made in 1997 and in following years.
One of the components is a controlled regime of "sleep restriction" in order to restore the homeostatic drive to sleep and encourage normal "sleep efficiency". [186] Stimulus control therapy is intended to limit behaviors intended to condition the body to sleep while in bed. [ 185 ]