Will someone please get the message to the Medium writers that there is no such word as "drempt"? P. Arquette has used it several times in promos I've seen. The correct word for the situation is dreamed. As for the show, I have seen it once and for a medium she is below average. It is totally unbelieveable, as in not believeable rather than the best I've seen.
Answer: the word is "dreamt". It is a real word used in the English language as a past tense verb of "dream". It is used entirely correctly in this case.