A dream question (Hebrew: She'elat Halom) is a practice of divination whereby a person attains a prophetic state while dreaming, receiving a divine answer to a question meditated on before sleep. According to Kabbalah, when the conscious mind is subdued, the subconscious mind emerges. Thus, in dreams, the soul is being rejuvenated while consciousness slips away.
The early medieval master Hai Gaon notes a method for attaining a dream question involving fasting, purification, and meditation on a text. Based on comments by Abraham ibn Ezra and others, scholar Moshe Idel has identified this text with Exodus 14:19-21, each verse of which contains 72 consonants alluding to a mystical series of Hebrew letters said to represent the true name of God.
Moshe Idel, Romanian-Israeli historian and philosopher of Jewish mysticism, has explored the concept of Se’elat Halom in his research of Kabbalah. In his work "On "She’elat Halom" in “Hasidei Askenaz: Sources and Influences", Idel points to Chagigah 5b in the Babylonian Talmud where God made a promise to the people of Israel, that despite being hidden from view, he will speak to them in dreams.