english: 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.
non_english: Op dit moment trendy omdat is aangetoond dat in de hersenen een hele reeks genen alleen tijdens de slaap worden ingeschakeld. Deze genen worden geassocieerd met restauratie