Anglo-Saxon Metrical Charm 3, Wi Dweorh, from the British Library MS Harley 585, provides evidence of remnants of shamanic thinking in the early Christian era of Anglo-Saxon England. It shows a depth of understanding of dream psychology that prefigures modern psychiatric techniques; provides clues as to the linguistic, religious, cultural, and folkloric origins of nightmares, and reflects a tradition of shamanism in Old English poetry. This paper illustrates these linguistic and folkloric themes, places the metrical charm within the shamanistic tradition of Old English poetics, and connects the charms value as a therapeutic device to modern psychiatric techniques.