Even a brief daytime nap can help the brain recover and improve the absorption of new information, according to researchers from the University of Geneva and the University Medical Center Freiburg. The results of the study were published in the journal NeuroImage.

The scientists showed that 40–50 minutes of daytime sleep is sufficient to reduce the overload of neural connections that accumulates during an active day. While awake, connections between nerve cells strengthen, which is important for learning, but over time this leads to saturation and reduces the brain’s ability to process new information. Sleep triggers a process of “synaptic cleaning,” freeing up brain resources for new connections.

The study involved 20 healthy young adults, who on different days either took a nap or stayed awake. Using electroencephalography and transcranial magnetic stimulation, the researchers assessed the flexibility of neural networks and their readiness to learn. After a daytime nap, participants showed reduced overall connectivity while simultaneously exhibiting an increased ability to form new connections, indicating a restorative effect.

According to the authors, these findings explain why people can concentrate better and learn more effectively after a short nap. The effect is particularly useful during periods of high mental load—in study, work, sports, or professions requiring attention and precision. The researchers emphasize, however, that this refers to a short daytime nap, not a substitute for nighttime sleep.