The brother of death

The Greeks gave sleep a brother: death. In Hesiod's Theogony, Night bears Hypnos and Thanatos, Sleep and Death, and has them dwell together. It is not a threat but a recognition. Every evening we cross a border from which we do not know for certain that we will return, and the two brothers keep that same threshold.

In the Iliad the image becomes a gesture. When the hero Sarpedon falls, it is Hypnos and Thanatos, "the twins", who lift his body and carry it home with care. Sleep is the gentle brother, the one you come back from; death the silent brother, the one you do not. Same mother, same gate, different outcomes.

Rome takes up the image and carves it in. In the sixth book of the Aeneid, at the entrance of the underworld, Virgil places "consanguineus Leti Sopor", Sleep the blood-kin of Death. Consanguineus: of the same blood. Not a neighbour, a relative.

But the threshold was not only a danger to fear: it was a place to inhabit with care. In the sanctuaries of Asclepius, at Epidaurus, the sick would sleep in the temple on purpose - the practice was called incubation - so that in sleep the god would come in a dream and point to the cure. Sleep as medicine, the dream as message. The ancients did not simply suffer the threshold: they prepared for it, with a rite and an attention.

Even dreams had two gates. In the Odyssey, Penelope says that dreams come out through two gateways: the gate of horn, through which the true dreams pass, and the gate of ivory, through which the deceptive ones come. Telling the true message from the false was already the problem then. It still is.

And the road? The gentle brother and the silent one keep the same border, and at the wheel that border stops being a metaphor. A drowsy driver is not "holding on": they are standing on the threshold of the two brothers, and sometimes it is no longer they who decide which way to pass. But the meaning of the myth is not fear. It is respect. The ancients treated the threshold with a rite; for us it would be enough to read the messages the body sends - the heavy eyelids, the sliding gaze, the kilometre we cannot remember - instead of ignoring them.

The gentle brother brings us back every morning. We only need not to ask him to do it while driving.