. 2019 May 16;7(5):e13421. doi: 10.2196/13421
©Yu-Hsuan Lin, Bo-Yu Wong, Yuan-Chien Pan, Yu-Chuan Chiu, Yang-Han Lee. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 16.05.2019.
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Figure 2.
Definition of sleep onset time, midpoint of sleep, and wake time. TST: total sleep time.