Cognitive Training for Shift Work and Night Work

1. The attention challenge of shift and night work

Shift work and night work often mean being awake and expected to perform during the biological night, and sleeping during the day when light and noise can shorten or fragment rest. Over days and weeks, many workers and the occupational health teams who support them associate this pattern with a harder-to-sustain attention span, slower reaction time and a higher chance of small errors during long or overnight shifts.

Because these effects are felt on the job rather than easily measured there, workplaces and workers often look for practical supports — sleep hygiene, strategic napping, light exposure, and increasingly, structured cognitive training — to help the brain stay engaged during demanding hours. This page focuses on what is, and is not, known about cognitive training specifically in that context.

2. What cognitive-training research shows about attention, memory and reaction time

Most controlled research on cognitive training and sleep-related functioning has not been carried out in shift or night worker populations, but it offers a useful starting point for what the training targets and how it has performed in other groups who also cope with disrupted or insufficient sleep.

The best-controlled study in this evidence set is a randomized controlled trial by Haimov and Shatil, which assigned older adults with chronic insomnia to eight weeks of home-based, personalized computerized cognitive training or to an active control program. Relative to the control group, the training group showed improvements on several cognitive measures, including response time, working memory, general memory, visual memory and the ability to avoid distractions, alongside improvements in sleep onset latency and sleep efficiency measured by actigraphy.

A more recent open-label feasibility study by Tapia and colleagues delivered self-guided cognitive training sessions over four weeks to adults reporting persistent sleep difficulties, using tasks that target sustained and selective attention, working memory, inhibitory control, cognitive flexibility and processing speed. The authors reported reductions in insomnia severity and sleep complaints alongside changes in executive functioning, but were explicit that the single-group design and modest sample mean the findings are preliminary rather than evidence of clinical benefit.

A separate line of work by Horowitz-Kraus and colleagues used a CogniFit-based program to train executive functions such as inhibition, simple reaction time, divided attention and shifting, in a study focused on reading outcomes rather than shift work. A small conference study by Curtis and colleagues compared cognitive training to less demanding computer activities in older adults with insomnia and in middle-aged adults with generalized anxiety disorder, finding that some cognitive measures improved more after training than after the comparison activity.

3. Cognitive domains trained — and why they matter on shift schedules

Commercial cognitive training programs, including the ones described above, are usually built around a set of everyday cognitive domains. None of these programs were validated specifically for shift or night work, but the domains they target overlap with the skills that matter for staying alert and accurate during long or overnight shifts.

• Sustained and selective attention The program described by Tapia and colleagues includes tasks that specifically target sustained and selective attention — the ability to keep focus on a task over time and filter out distractions.
• Reaction (response) time Horowitz-Kraus and colleagues describe training tasks for simple reaction time as part of a broader executive-function training program.
• Working memory Working-memory tasks, which involve holding and updating information over short periods, appear across the programs reviewed here, including the trial by Haimov and Shatil.
• Inhibitory control and cognitive flexibility Tasks that require inhibiting an automatic response or switching between rules — inhibition and shifting — are included in both the Tapia et al. and Horowitz-Kraus training programs.
• Divided attention Divided-attention tasks, which ask a person to track more than one source of information at once, are part of the training battery used in the Haimov and Shatil trial.

4. Where the evidence is thin for shift and night workers

None of the studies described on this page recruited shift workers or night workers, and none measured outcomes such as workplace error rates, near-misses or accident risk. The Haimov and Shatil trial studied older adults with clinically confirmed chronic insomnia; the Tapia et al. feasibility study recruited community adults with self-reported persistent sleep difficulties; and the Curtis et al. work involved older adults with insomnia and middle-aged adults with generalized anxiety disorder. None of these samples match the schedules or sleep patterns typical of rotating or night-shift work.

The Tapia et al. study is also explicit about its own limits: it used a single group with no control condition and a modest sample, so the authors describe the findings as preliminary and call for larger randomized trials before any conclusions about benefit can be drawn. The same caution applies here — this page describes what has been studied, not what cognitive training does for people working night shifts, and nothing here should be read as a claim about changes to on-the-job error rates or safety outcomes.

Occupational health teams supporting shift and night workers may still find the underlying cognitive domains — attention, reaction time, working memory — useful to think about, but decisions about fatigue-risk management, scheduling and workplace safety should rest on occupational health and safety guidance rather than on this evidence alone.