Issue Navigator

Volume 14 No. 06
Earn CME
Accepted Papers

Emerging Technologies

Validation of the Sleep-Wake Scoring of a New Wrist-Worn Sleep Monitoring Device

Wilfred R. Pigeon, PhD1,2; Maddison Taylor1; Ashley Bui1; Courteney Oleynk1; Patrick Walsh, PhD1; Todd M. Bishop, PhD1,2
1Department of Psychiatry, University of Rochester Medical Center, Rochester, New York; 2VISN 2 Center of Excellence for Suicide Prevention, Canandaigua VA Medical Center, Canandaigua, New York

Study Objectives:

To test the sleep-wake scoring reliability of a new wrist-worn sleep monitoring device.


Twenty-seven adult good sleepers underwent 1 night of polysomnography (PSG) while wearing both the new device (myCadian [MC]; CurAegis Technologies, Rochester, New York, United States) and commercially available actigraphy (Actiwatch 2 [AW]; Philips Respironics, Murrysville, Pennsylvania, United States) on their nondominant wrist. PSG tests were manually stage scored. After excluding missing data, 20 participants had full-night data on all three devices with 17,734 total 30-second epochs. Using PSG as the gold standard, pooled epoch-by-epoch agreement for sleep and wake was calculated for each device using percent agreement and Cohen kappa statistic. Positive predictive values for both sleep and wake epochs, as well as sleep continuity statistics, were calculated.


Percent agreement with PSG-scored wake and sleep was 91.3% for MC (kappa = 0.67) and 87.7% for AW (kappa = 0.50). Positive predictive values for sleep epochs were 94.4% and 90.8% for MC and AW, respectively, and 74.5% and 65.6% for wake. Both devices underestimated wake and overestimated sleep compared to PSG. Descriptively, compared to PSG, sleep latency was higher with MC and wake after sleep onset higher with AW. Total sleep time and sleep efficiency were more similar across devices.


The kappa statistic for MC is consistent with a high level of agreement with PSG. Overall, the reliability of MC compared to PSG scoring was slightly more favorable than that of AW. Findings suggest that MC provides reliable sleep-wake scoring during a nocturnal sleep period for good sleepers.


Pigeon WR, Taylor M, Bui A, Oleynk C, Walsh P, Bishop TM. Validation of the sleep-wake scoring of a new wrist-worn sleep monitoring device. J Clin Sleep Med. 2018;14(6):1057–1062.

Please login to continue reading the full article

Subscribers to JCSM get full access to current and past issues of the JCSM.

Login to JCSM

Not a subscriber?

Join the American Academy of Sleep Medicine and receive a subscription to JCSM with your membership

Subscribe to JCSM:  $75/volume year for individuals or $140/volume year for institutions to access all current articles and archives published in JCSM.

Download this article*:   $20 to access a PDF version of a specific article from the current issue of JCSM.

*Purchase of an electronic download of JCSM provides permission to access and print the issue/article for personal scholarly, research and educational use. Please note: access to the article is from the computer on which the article is purchased ONLY. Purchase of the article does not permit distribution, electronic or otherwise, of the article without the written permission of the AASM. Further, purchase does not permit the posting of article text on an online forum or website.