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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.
In the early 1990s, the University of Minnesota's landmark School Start Time Study tracked high school students from two Minneapolis-area districts – Edina, a suburban district that changed its opening hour from 7:20 a.m. to 8:30 a.m. and the Minneapolis Public Schools, which changed their opening from 7:20 a.m. to 8:40 a.m.
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.
After the invention of the EEG, the stages of sleep were determined in 1936 by Harvey and Loomis, the first descriptions of delta and theta waves were made by Walter and Dovey, and REM sleep was discovered in 1953. Sleep apnea was identified in 1965. [2] In 1970, the first clinical sleep laboratory was developed at Stanford. [3]
[144] [145] Ekirch attributes the change to increases in "street lighting, domestic lighting and a surge in coffee houses," which slowly made nighttime a legitimate time for activity, decreasing the time available for rest. [145] Today in most societies people sleep during the night, but in very hot climates they may sleep during the day. [146]
Georgi Lozanov (Bulgarian: Георги Лозанов; 22 July 1926 – 6 May 2012), known as 'the father of accelerated learning', was a Bulgarian scientist, neurologist, psychiatrist, psychologist and educator, creator of suggestology, suggestopedia (or 'suggestopaedia', an experimental branch of suggestology for use in pedagogy), and integrated psychotherapy.
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Young woman asleep over study materials. The relationship between sleep and memory has been studied since at least the early 19th century.Memory, the cognitive process of storing and retrieving past experiences, learning and recognition, [1] is a product of brain plasticity, the structural changes within synapses that create associations between stimuli.