Z. Chen, M. Lin, F. Chen, N. D. Lane, G. Cardone et al., Unobtrusive Sleep Monitoring using Smartphones, Proceedings of the ICTs for improving Patients Rehabilitation Research Techniques, pp.145-152, 2013.
DOI : 10.4108/icst.pervasivehealth.2013.252148

E. K. Choe, S. Consolvo, N. F. Watson, and J. A. Kientz, Opportunities for computing technologies to support healthy sleep behaviors, Proceedings of the 2011 annual conference on Human factors in computing systems, CHI '11, pp.3053-3062, 2011.
DOI : 10.1145/1978942.1979395

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.675.1688

. Gartner, Gartner Says in 2015, 50 Percent of People Considering Buying a Smart Wrist- band Will Choose a Smartwatch Instead, 2015.

F. Guo, Y. Li, M. S. Kankanhalli, and M. S. Brown, An evaluation of wearable activity monitoring devices, Proceedings of the 1st ACM international workshop on Personal data meets distributed multimedia, PDM '13, pp.31-34, 2013.
DOI : 10.1145/2509352.2512882

G. Paul and J. Irvine, Privacy Implications of Wearable Health Devices, Proceedings of the 7th International Conference on Security of Information and Networks, SIN '14, pp.117-117121, 2014.
DOI : 10.1016/S0736-5853(01)00013-2