A miniature actigraph worn about the wrist (Mini Motionlogger, Ambulatory Monitoring, Inc. Ardsley, NY) was used To judge sleep quality objectively, rendering it probable to watch sleep under natural conditions with nominal distortions. The actigraph actions wrist activity employing a piezoelectric element and interprets wrist movements into an electrical https://www.youtube.com/watch?v=PgNzdZr0_hg