actigraphy
n.— «They also filled out sleep questionnaires, kept a log of their hours in bed and participated in six nights of sleep studies with a technique called wrist actigraphy that uses a motion sensor—worn like a watch—to estimate actual sleep duration.» —“Heart Disease Associated With Lack of Sleep” by Lynn Shapiro DOTmed.com Dec. 29, 2008. (source: Double-Tongued Dictionary)
Further reading
A French idiom that means “to sleep in” or “lie around lazily in bed after waking” is faire la grasse matinée, literally to “make the fat morning.” If you fall in love easily, you’re said to have un coeur...
What do you call a segment of an orange? These juicy pieces of fruit go by lots of different names, including section, wedge, and carpel. But they’re also called pegs or even pigs! The stringy parts of a banana also have a surprising name...