Harvard Health Blog
Wearables and sleep: What can they really tell us?
By: Katherine Dudley, MD, MPH, Contributor Smart devices are everywhere, including wrist-based monitors. These wearables promise to count our steps, remind us to move, and provide insight on our sleep. But can we trust them to measure our sleep accurately? Most wrist-based devices are based on an accelerometer, which measures wrist movement. The data gathered from the accelerometer — how often the wrist moves and how forceful that movement is — are coded as sleep