actigraphy

noun
ac·​tig·​ra·​phy | \ ak-ˈti-grə-fē How to pronounce actigraphy (audio) \

Medical Definition of actigraphy

: the use of an actigraph to make a record of the activity level of the body especially in measuring the amount and quality of sleep Actigraphy is an objective test that is useful in identifying sleep-state misperception, sleep-interruption insomnia, and circadian rhythm disorders.— Carlos H. Schenck et al., The Journal of the American Medical Association, 21 May 2003

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an act or instance of returning to life

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