On the virtues of sleeping like a sloth

Down with the larks. Joel Frohlich, a postdoctoral researcher studying consciousness in the laboratory of Martin Monti at the University of California, Los Angeles, explains how "though it might feel like we aren't doing anything when we sleep, nothing could be further from the truth. During sleep, the fluid-filled ventricles of the brain open so that deadly toxins — including the amyloid plaques that cause Alzheimer's disease — can drain." Here, he highlights the importance of good sleep for our health.