A sleepless night prevents the brain from eliminating its molecular waste, a process that cannot be compensated for by a single night of recovery sleep.

noli's read

This advice is based on neuroscience research regarding the glymphatic system, which is responsible for clearing metabolic proteins such as beta-amyloid. Studies on animal models and human observations (notably published in 'Science' and 'Nature Communications') confirm that deep sleep is crucial for this cerebral 'purification.' The assertion that a recovery night is insufficient to fully compensate for this effect is supported by studies on sleep restriction (RCT and observational), showing that cognitive and metabolic deficits often persist after a short recovery phase. What is sometimes exaggerated in popular science is the idea that the brain is permanently damaged immediately; research instead suggests increased long-term vulnerability. There is no evidence that this process is irreversible, but the concept of complete 'catch-up' is scientifically contested.

the sources

1. 1Xie L, Kang H, Xu Q, et al. 2013
2. 2Depner CM, Melanson EL, Eckel RH, et al. 2019