TAP reading note: The impact of reduced worktime on sleep and perceived stress - a group randomized intervention study using diary data
With retained salary and funding for additional staff, reduced worktime was associated at 18 months with approximately 23 more minutes of diary-reported sleep on workdays and less perceived stress and sleepiness. The effect concerns this combined arrangement, not every possible four-day-week policy.
Updated 2026-10-29 · Archived
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What the study found
With retained salary and funding for additional staff, reduced worktime was associated at 18 months with approximately 23 more minutes of diary-reported sleep on workdays and less perceived stress and sleepiness. The effect concerns this combined arrangement, not every possible four-day-week policy.
Scope & limitations
33 workplaces and 580 analysed participants: 354 intervention and 226 control, 76% women. Of 919 initially included, 98 withdrew after allocation and further analysis criteria were applied.
One workplace was assigned nonrandomly to control because of recruitment conditions. Post-allocation adherence/follow-up criteria mean this is not a complete intention-to-treat analysis. Self-reported diaries, clustering and selective retention constrain interpretation.
Population & sample
33 workplaces and 580 analysed participants: 354 intervention and 226 control, 76% women. Of 919 initially included, 98 withdrew after allocation and further analysis criteria were applied.
Exposure or intervention
Planned 25% worktime reduction with salary retained, extra hiring funds and restrictions on additional paid work; usual arrangements in controls. Actual reduction was about 20% in diary weeks and 25% in monthly payroll records.
Outcomes
Diary sleep, sleepiness and perceived stress; no common objective physiological-recovery endpoint.
Time frame
18-month intervention follow-up.
Research funding
Not yet verified against the full text.
Research conflicts of interest
Not yet verified against the full text.
Reading scope
Original full-text workplace allocation, sample flow, implementation, results and limitations. All cluster/attrition sensitivity analyses remain to be checked.
References
Publication record
TAP-RDN-0059 · v1.0 · English
Author: TAP Editorial Team ·
The Allostasis Project is founded and supported by Resilio.
Record for v1.0 · Updated
Editorial responsibility: TAP Editorial Team
Scientific review
Not yet scientifically reviewed
Editorial note
Under the editorial responsibility of the TAP Editorial Team, this publication used AI assistance for content organization and editing. Scientific review is recorded separately on this page.
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Record integrity & available editions
SHA-256: 13e93df3e3d8ad0d9500bbf955f2ee61cdeb387a05058a9179d708670879b070
Captured: 2026-10-29T10:31:13.625Z
- v1.0 · 2026-10-29