. Author manuscript; available in PMC: 2020 Jul 1.

Published in final edited form as: IEEE J Biomed Health Inform. 2018 Aug 29;23(4):1607–1617. doi: 10.1109/JBHI.2018.2867619

TABLE I.

Feature sets for sleep detection

Source	Modality	Feature variables
Wrist sensor	Skin conductance (SC)	Mean, SD, power within 0–0.1, 0.1–0.2, 0.2–0.3, 0.3–0.4, and 0.4 –0.5Hz bands, the number of SC responses, storm flag, elapsed time since a storm started
	Acceleration (ACC)	Mean, SD
	Skin temperature (ST)	Mean, SD
Phone	Screen	Screen was on, the time the screen was turned on
	SMS	Sent a message
	Call	On a call, missed a call
	Location	Movement index, connected to WiFi, connected to cellular nets
Time	Time	Elapsed minutes since 12:00 AM