Dream Scanning
I have yet to read the scientific journal, but they really should use Narcoleptics for this study. Narcoleptics will usually have a dream in the first 15 minutes of sleep and it only takes them 5- 6 minutes to go to sleep. They also have Hypnagogic hallucinations in the first part of their screwed up sleep stage. They could compare dreams to these types of hallucinations and see how much more active or not the hassucinations are.