การฝันแบบ Lucid dream นั้นมีความเกี่ยวเนื่องกับอาการ REM หรือ Rapid eve movement ซึ่งอาการนี้คือความสามารถในการกรอกตาไปมาในขณะที่กำลังฝันอยู่ ซึ่งวิธีนี้จะเป็นวิธีหลักที่นักวิทยาศาสตร์ใช้สื่อสารกับผู้ทดลอง
Scientists can now talk to people through their dream without waking them up. Like sci-fi movies came true, a team of scientists found a way to communicate with people through their dream. They selected people who have experienced lucid dreaming (dreamers are aware that they are dreaming and somehow can control things)
The scientists would signal the dreamers when they started dreaming by flashing light or tapping fingers. Then, they would communicate with dreamers by, for example, asking simple spoken questions. The scientist would previously tell the dreamers to answer in specific ways, such as moving their eyes to the left three times.
One dreamer reported that he heard the question from a radio in their dream. Another said that it was like he was in a movie, and the question was from the narrator. 18.6% of subjects responded correctly. Although it seems not much, it signified the success of entering a person's dreams. Dreams are like another world made of individual memories. So, entering a person's dreams is equal to entering into the new world.