svefnþorn
nafnorðkarlkynsvefn-þorn
m. a ‘sleep-thorn;’ the popular notion was that charmed sleep is produced by putting the ‘sleep-thorn’ into the sleeper’s ears, then he will not awake until the thorn falls out; stinga e-m svefnþorn, to stick one with the sleeping-thorn, Fas. i. 18, 19; or, stinga e-n svefnþorni, Ísl. ii. 183, iii. 303, (cp. Fm. 43, Hrafnag. 13.)