Midrasch zu Jirmejahu 23:28

R. Chisda said: "Every dream is good except that of fasting." Further said R. Chisda: "Of a bad dream the worry is sufficient [to dissipate it], and of a good one the joy is sufficient [to dissipate it]." R. Joseph said: "Even to me [though blind] the humor of a good dream causes it to dissipate." Further said R. Chisda: "A bad dream is much better than a good one [because it may result in repentance]." Further said R. Chisda: "Neither a good dream nor a bad one is fully fulfilled." Again said R. Chisda: "A dream not interrupted is like a letter not read." Further said R. Chisda: "A bad dream is more severe than being lashed, for it is said (Ecc. 3, 14.) And God hath so made it that men should be afraid of Him, and Rabba b. b. Chana said in the name of R. Jochanan: 'This refers to a bad dream.' " The prophet that hath had a dream, let him relate his dream; and he that hath received my word, let him speak my word of truth. What hath the straw to do with the corn? Saith the Lord (Jer. 23, 28). What relation has corn and straw to a dream? R. Jochanan in the name of R. Simon b. Jochai said: "Just as it is impossible for corn to be without straw, so it is impossible for a dream to be without absurdities."