Analysis of information sources in references of the Wikipedia article "Non-rapid eye movement sleep" in English language version.
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(help)The 1968 categorization of the combined Sleep Stages 3–4 was reclassified in 2007 as Stage N3.
Visually scored delta activity (stages 3 and 4, SWS) as well as computerized delta activity measures increase after total and selective sleep deprivation. It is, however, still controversial if SWS amount is only a function of prior waking duration, or if it is related to the structure of the previous sleep period
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(help)The 1968 categorization of the combined Sleep Stages 3–4 was reclassified in 2007 as Stage N3.