Actigraphy was employed to provide objective measures of motion not subject to patient recall. The actigraph is a waterproof wristwatch-size battery-operated activity monitor (Actical, Phillips Respironics, Bend, OR) placed on the non-dominant wrist of each subject and worn 24 hours/day for up to 10 days. Since the device quantifies and records average movement over each 15 second (epoch) continuously 24 hours/day, these recordings include periods of activity (arousal) and non-activity (rest). Several measures are used to summarize activity including total daily activity, and intensity of daily activity [59]
