ility and clinical utility of passive EMA of specific activities, such as (disturbed) sleep, sedentary behavior, and energy expenditure <span class="citation">(see, e.g., Feehan et al., <a href="#ref-Feehan2018">2018</a>; Gomersall, Ng, Burton, Pavey, &amp; Gilson, <a href="#ref-Gomersall2016">2016</a>)</span>, an increasing number of mental health studies are including activity tracking devices to better understand sleep habits, circadian rhythm disorders and depression <span class="citation">(see, e.g., C