Besides this fact that the night befriends and masks every treacherous foe, it is also to be remembered that man is weakest at night. Not only is he weaker than by day in the veil drawn over his senses, but physiologically also. When the body is wearied out by the toils or combats of the day, and the mind haunted by dreams of danger, there are present all the terrors which Byron portrays around the restless pillow of Sardanapalus. The war-horse of the day becomes a night-mare in the darkness. In the Heimskringla it is recorded: 'Vanland, Svegdir's son, succeeded his father and ruled over the Upsal domain. He was a great warrior, and went far around in different lands. Once he took up his winter abode in Finland with Snio the Old, and got his daughter Drisa in marriage; but in spring he set out leaving Drisa behind, and although he had promised to return within three years he did not come back for ten. Then Drisa sent a message to the witch Hulda; and sent Visbur, her son by Vanland, to Sweden. Drisa bribed the witch-wife Hulda, either that she should bewitch Vanland to return to Finland or kill him. When this witch-work was going on Vanland was at Upsal, and a great desire came over him to go to Finland, but his friends and counsellors advised him against it, and said the witchcraft of the Fin people showed itself in this desire of his to go there. He then became very drowsy, and laid himself down to sleep; but when he had slept but a little while he cried out, saying, 'Mara was treading on him.' His men hastened to help him; but when they took hold of his head she trod on his legs, and when they laid hold of his legs she pressed upon his head; and it was his death.' [168] This witch is, no doubt, Hildur, a Walkyr of the Edda, leading heroes to Walhalla. Indeed, in Westphalia, nightmare is called Walriderske. It is a curious fact that 'Mara' should be preserved in the French word for nightmare, Cauche-mar, 'cauche' being from Latin calcare, to tread. Through Teutonic folklore this Night-demon of many names, having floated from England in a sieve paddled with cow-ribs, rides to the distress of an increasingly unheroic part of the population. Nearly always still the 'Mahrt' is said to be a pretty woman,--sometimes, indeed, a sweetheart is involuntarily transformed to one,--every rustic settlement abounding with tales of how the demoness has been captured by stopping the keyhole, calling the ridden sleeper by his baptismal name, and making the sign of the cross; by such process the wicked beauty appears in human form, and is apt to marry the sleeper, with usually evil results. The fondness of cats for getting on the breasts of sleepers, or near their breath, for warmth, has made that animal a common form of the 'Mahrt.' Sometimes it is a black fly with red ring around its neck. This demoness is believed to suffer more pain than it inflicts, and vainly endeavours to destroy herself.