The nap is an appointment that many people have during the afternoon and that is very difficult to leave aside. For decades, this practice has oscillated between being a purely Mediterranean cultural trait and an endlessly repeated productivity hack. However, taking a short break during the day is not a luxury for some, but is a top-level brain maintenance mechanism.
They Have Studied It. To prove exactly why napping is so beneficial, a study chose to investigate the effects it has on the brain. Their objective was none other than to check if a short period of sleep could trigger the same ‘brain cleansing’ processes that occur during sleep. And the answer is a resounding yes.
Neuronal Saturation. To understand the impact of the study, you must first grasp the synaptic homeostasis hypothesis. This concept tells us that since we wake up, our brain processes information non-stop, continually strengthening the connections between our neurons. A classic example may be a student trying to learn an opposition syllabus.
The problem is that this continuous increase in synaptic strength consumes a lot of energy and takes up physical and metabolic space. Eventually, there comes a point in the day when the brain is “saturated,” and cortical excitability is so high that the ability to consolidate new information plummets. This is when the system literally asks us to “reset” to continue processing information.
How Have They Seen It? The experiment involved 20 young adults, and rather than relying on subjective surveys of “how rested they felt,” the team turned to direct physical measurements. They employed Transcranial Magnetic Stimulation to measure corticospinal excitability and electroencephalograms to monitor brain activity.
Once the method was in place, researchers evaluated the participants first between 1:15 p.m. and 2:15 p.m., after spending a significant time awake, and then again following a 45-minute nap.
The Results. These analyses revealed that the brain cleaned its neurons, weakening irrelevant connections and lowering the “background noise.” This returned the system to an optimal state for creating new connections. Additionally, by releasing this charge, neurons regained a high capacity for Long Term Enhancement, meaning the brain was once again positioned optimally to create lasting memories.
The 20 Minute Rule. A common belief is that the optimal nap should last only 20 minutes to quickly regain alertness. However, this study suggests that to achieve a true architectural recalibration of plasticity in the cerebral cortex, engaging in a cycle of about 45 minutes allows memory consolidation mechanisms to act more profoundly.
Thus, taking a break during the day is not just a ‘lazy’ indulgence but a brain recalibration system that can significantly boost productivity while working or studying.
In Xataka | In Spain, we have glorified the long nap. Scientific studies, however, have a different viewpoint on the matter.