This dream incubation procedure is described in chapter 34 of “Dreams: Guide to the Soul.”
Dream 164: Incubating White Socks
A 19-year-old girl dreamt that she incubated a dream involving asking herself the question “why do I place myself in dangerous situations?” When she awakened she had a vivid image of white socks.
Clothing represents protective defenses. To be specific, socks protect the part of our body that support us and get us somewhere in life. White is a spiritual color. The dream was saying she put herself in dangerous situations as a spiritual test, i.e., making it through a dangerous situation would mean that she was spiritually protected on her quests through life which meant to her that she was a worthwhile person.
Dream incubation interpretations are described in my book at http://www.drstevenfox.com