and elderly patients. Disadvantages The actigraph is recorded at home, and therefore a high compliance is needed: patients need to complete a sleep diary and always wear the watch. Sometimes, the actigraph doesn't properly record sleep; for example, a nap during a car ride isn't always logged as sleep. In contrast, showers close to the sleep period can be erroneously recorded as sleep. These false positives are relatively common: while actigraphy is good at detecting sleep patterns (sensitivity: 0.965), it has its difficulties in detecting wake periods (specificity: 0.329). As an electronic device, there can be unobserved technical malfunctions that detrimentally affect actigraphic measurement. Consumer electronics devices Some consumer electronics devices, such as the Oura Ring and the Huawei Honor Band, employ actigraphy to estimate sleep patterns. Other devices, such as the Fitbit Alta HR, have been found to provide equivalent estimates across all traditional sleep parameters, compared to more traditional actigraph units. References External links American Academy of Sleep Medicine—Parameters for the Use of Actigraphy in the Assessment of Sleep and Sleep Disorders: An Update for 2007 American Academy of Sleep Medicine – Practice parameters for the role of actigraphy in the study of sleep and circadian rhythms: An update for 2002 Reliability of Accelerometry-Based Activity Monitors: A Generalizability Study. Gregory J. Welk, Jodee A. Schaben, and James R. Morrow, Jr. Medicine & Science In Sports & Exercise, Vol. 36, No. 9, pp. 1637–1645, 2004. – Medicine & Science in Sports & Medicine, the official Journal of the American College of Sports Medicine Measuring instruments Neurology procedures Circadian rhythm Sleep