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http://dx.doi.org/10.1037/10166-012
documents the various [single-Hertz] EEG changes that occur during the transition period [between wakefulness and sleep] / [suggest that these changes may] be related to parallel changes in other measures that have been reported during sleep, such as (a) general reduction in sensory awareness and responsiveness . . . , (b) loss of memory (amnesia) for new events . . . , (c) absence of elicited skin conductance responses . . . , (d) drop in body temperature and change in temperature set point . . . , and (e) respiratory changes
[Ss were 14 undergraduate students age 18–21 yrs] (PsycINFO Database Record (c) 2016 APA, all rights reserved)