Be merciless in his sleep - is in trouble. If you dream you were cruel to children, the elderly or infirm animals, in reality it threatens you serious problems associated with not the best traits of your character. People in the dream were unmerciful against you - then you shall be exalted in the eyes of native people, having made a noble deed. See how someone did not show mercy when other people needed it - is to the unenviable fate of your friend.