It's fashionable at the moment because what's been shown is that within the brain, a whole raft of genes have been shown to be turned on only during sleep, and those genes are associated with restoration and metabolic pathways.
Está de moda en este ahora porque se ha demostrado que dentro del cerebro, toda una serie de genes se activan solo durante el sueño y esos genes están asociados con la restauración y las rutas metabólicas.