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
When does late at night change to early in the morning? 2:30 a.m.? 3:00 a.m.? Another time? This is part of a complete episode. Transcript of “When Does Late Night Become Early Morn?” Listener Greg Johnson asked a question that...
An old Irish curse goes: May the devil make a ladder of your backbones while picking apples in the garden of hell. If you’d rather offer someone a friendlier wish, try May angels bless your sleep with the smell of apple pies. This is part of a...