Not Just a Nap: How to Improve Concentration After a Sleepless Night

A new study examined whether a nap or short physical activity helps memory after severe sleep deprivation. 54 adults were kept awake for 30 hours, then divided into three groups: 20 minutes of cycling, a 90-minute nap, or sitting without activity. The recognition rate in a memory test was 56% in the exercise group, 57% in the nap group, and 46% in the control group. Researchers found that both interventions improved memory by about 21% and 23% respectively, but through different mechanisms: napping reduced sleep pressure, while exercise improved the brain's information processing efficiency.

A new study published in the journal Proceedings of the National Academy of Sciences examined the effects of a nap versus short physical activity on memory after severe sleep deprivation. Researchers recruited 54 healthy adults aged 18 to 35 and kept them awake for 30 hours. They were then divided into three groups: one group performed 20 minutes of moderate-to-high intensity cycling, a second group had the opportunity to nap for 90 minutes, and the third group sat on stationary bikes without activity for 20 minutes. After the interventions, participants were shown 150 images, and three days later they were tested on recognition. Results showed a recognition rate of 56% in the exercise group, compared to 57% among nappers and only 46% in the control group. Researchers found that memory performance was about 21% higher after exercise and about 23% higher after napping, with no significant difference between the two groups. However, those who napped felt less tired, while exercisers reported a similar fatigue level to the control group. The explanation: napping reduced sleep pressure, while exercise helped the brain use remaining cognitive resources more efficiently. The article emphasizes that physical activity is not a substitute for sleep and does not make driving or dangerous tasks safe after a sleepless night.