Sleep deprived and short on time? The science says move.

New research shows that a short, intense workout can help protect memory after a sleepless night — performing as well as a much longer nap.

Our own workplace data points in the same direction.

What the new study found

A study from McGill University examined cognitive performance after prolonged sleep deprivation.

After 30 hours without sleep, participants who completed 20 minutes of intense exercise performed around 22% better on memory tests than those who did neither exercise nor nap.

Remarkably, this improvement was comparable to the effect of a 90-minute nap.

The study used a relatively small sample, so the findings should be treated as an important signal rather than a definitive conclusion. But they raise an interesting question: can short periods of intense exercise provide a rapid cognitive boost when sleep has been compromised?

Does it hold at work?

Our workplace data suggests that it does.

Across the OwnLife Analytics benchmark population, just 15 minutes of high-intensity exercise is strongly associated with higher cognitive performance across every domain we measure.

Importantly, this effect is not limited to people who are sleep deprived. The positive association appears across the wider working population and can be seen within hours of exercise.

15 minutes of exercise can make a measurable difference

Our data shows that, in the four hours following intense exercise, the relative risk of low cognitive performance falls across all four measured cognitive domains.

Working Memory shows the largest effect, with relative risk falling by 33%.

Attention falls by 28%.

Cognitive Flexibility falls by 22%.

Processing Speed falls by 21%.

Treat exercise as a cognitive tool, not just a fitness tool

The implication is practical.

After a poor night’s sleep, consider moving before tackling your most demanding work.

Around 15–20 minutes of intense exercise may be enough to make a meaningful difference.

And unlike many longer-term fitness benefits, the cognitive effect appears to show up within hours rather than weeks.

Exercise is not a replacement for good sleep. But on the days when sleep falls short, it may be one of the most powerful short-term levers available to support cognitive performance.

The takeaway

Short on sleep? Move first.

New research suggests that a 20-minute workout can protect memory as effectively as a 90-minute nap after sleep deprivation.

Alongside this, OwnLife Analytics data shows that 15 minutes of intense exercise is associated with a lower risk of poor cognitive performance across Working Memory, Attention, Cognitive Flexibility and Processing Speed.

Data source: OwnLife Analytics platform data, 2026. External research referenced: Lotlikar et al., 2026, PNAS / McGill University.