Hitherto Othello had borne up manfully against the cruel insinuations of Iago--but this sleep-revelation "denoted a foregone conclusion," and carried with it irresistible conviction. Upon the same principle, Lord Byron founded the story of "Parisina." Not long ago a robbery was committed in Scotland, which was discovered by one of the guilty parties being overheard muttering some facts connected with it in his sleep. Mental anxiety will, almost at any age, give rise to sleep-talking. The ideas of children during sleep are often very vivid; nor is there any thing more common than to hear them utter expressions of distress, connected, particularly, with any fears that may, unwisely, have been impressed on the waking mind. The case of a little girl came lately under our notice, who exhibited the most alarming symptoms during sleep; sobbing and imploring help, under the imagination that she was being pursued by an evil spirit; in consequence of a foolish, fanatical person having frightened her with threats of this description, while the child, before going to bed, was saying her prayers. Very much convulsed inwardly, she was with difficulty awakened, and for some time afterward remained in a state of agitation bordering on delirium. Assuredly parents can not be too careful in endeavoring to make very young children go to bed with composed and happy minds, otherwise they know not what hideous phantoms may draw aside the curtain of their sleep; and, by terrifying the imagination, produce fits, that may be incurable in after-life. We believe it quite possible that epilepsy itself may be so produced.