While our body is still and our mind is off walking in dreams somewhere, the elegant machinery of the brain is quietly hard at work cleaning and maintaining this unimaginably complex machine.
Mentres o noso corpo está parado e a nosa mente vaga por aí en soños, a elegante maquinaria do cerebro está en silencio traballando duro limpando e mantendo esta máquina incribelmente complexa.