actigraphy

noun

ac·​tig·​ra·​phy ak-ˈti-grə-fē 

: 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