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.
most megint divatos, mert  amiket mutattam az előbb az agyban, az összes gén, csak az alvás alatt aktív, és ezeknek a géneknek  közük van a helyreállításhoz,