Figure III.
RCT Timeline and Experimental Design
This figure presents an overview of the timeline and experimental design of the study. After eight baseline days, the 452 participants were divided into three night sleep treatment groups: control, sleep devices + encouragement, and sleep devices + incentives. Participants in each of these groups were further randomized into a nap group, which was allowed and encouraged to use a nap station in the office in the early afternoon, and a no-nap group. Participants in the no-nap group were further randomized on a daily level (i.e., within individual) either to being allowed to work during the nap period or to take a mandatory pause during that time, with equal probability. The nap treatment ends at day 27, and the participants return the sleep devices on day 28. Endline surveys occur on day 28 or shortly thereafter.