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
Diamond dust, tapioca snow, and sugar icebergs — a 1955 glossary of arctic and subarctic terms describes the environment in ways that sound poetic. And a mom says her son is dating someone who’s non-binary. She supports their relationship, but...
A librarian opens a book and finds a mysterious invitation scribbled on the back of a business card. Another discovers a child’s letter to the Tooth Fairy, tucked into a book decades ago. What stories are left untold by these forgotten...