dwale
noun
°(obsolete) a sleeping-potion, especially one made from belladonna.
"Late C14: To bedde goþ Aleyne and also John; / Þer nas na moore – hem nedede no dwale. — Geoffrey Chaucer, The Reeve's Tale"
°belladonna itself, deadly nightshade; or some other soporific plant.
"1842: Beneath and around the clumps of ragged moss-grown elder and hoary stunted whitethorn (...) rise thickets of tall nettles and rank hemlock, concealing the deadly but alluring dwale — J. van Voorst, The Phytologist, p. 595."