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Second part of the article about science behind Sleepman discusses the viability of electrodermal activity (EDA) sensing for measuring quality of sleep and why the company decided to use it over electroencephalography. Sleepman uses EDA sensors because Avantechs deemed electroencephalography to be too unwieldy and uncomfortable for nightly and daily use.
Electrodermal activity, or also referred to as galvanic skin responseor skin conductance, is a measure of autonomic changes in the electrical properties of the skin in response to sweat secretion.<ref>http://www.sciencedirect. com/science/article/pii/S0165027010002335</ref><ref>https://imotions.com/blog/gsr/</ref> It has been used in the research on stress<ref>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3386730/</ref><ref>http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5325784</ref>, anxiety levels<ref>http://www.sciencedirect.com/science/article/pii/S0165178198000663</ref><ref>https://www.scopus.com/record/display.uri?eid=2-s2.0-36849010148&origin=inward&txGid=0</ref>, and emotional arousal. <ref>http://iopscience.iop.org/article/10.1088/0967-3334/32/10/002/meta;jsessionid=8ABCA3BA9387787F1E505533F4898408.c3.iopscience.cld.iop.org</ref> Studies shown that the link between EDA and different cognitive states can indeed be used to measure them.
The article concludes with describing the benefits of 'power napping' and the scientific research about it.<ref>https://sleepman.com/sciencedevelopment/#science</ref>
TODO: Dočíst http://www.sciencedirect.com/science/article/pii/S0263224113002571
TODO: Dočíst http://www.birmingham.ac.uk/Documents/college-les/psych/saal/guide-electrodermal-activity.pdf
TODO: Rozepsat citace
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