"Yes I have" -> "Yes, I have."
"Once I dreamed about I stood on the edge of cliff," -> "Once, I dreamed about standing on the edge of a cliff,"
"and someone was chasing me and want to kill me." -> "and someone was chasing me and wanted to kill me."
"As soon as he caught me suddenly I woke up." -> "As soon as he caught me, I woke up." or "He caught me and I suddenly woke up."
Notes: For the "Once, I dreamed..." sentence, you might consider making it into two separate sentences:
"Once, I dreamed about standing on the edge of a cliff. Someone was chasing me and wanted to kill me."
The last sentence only needs to reference the time you woke up once; use either 'suddenly' or "as soon as" but not both.
Finally, consider that there's a disconnect; you are standing at the edge of a cliff, but you are also being chased. Are you not running away? Were you running, but then you reached the cliff?