Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Apr 8;136(3):1887–1941. doi: 10.1093/qje/qjab013

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2021. Published by Oxford University Press on behalf of the President and Fellows of Harvard College.

This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

PMC Copyright notice

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.