New research concludes that dreams may not mean anything but they shape humans'judgment and behavior.
The findings are based on six different studies, in which researchers surveyed nearly 1,100 people about their dreams.
"Psychologists' interpretations of the meaning of dreams vary widely. But our research shows that people believe their dreams provide meaningful insight into themselves and their world, "said Carey Morewedge, an assistant professor at Carnegie Mellon University and the study's lead author.
In one study that surveyed general beliefs about dreams, Morewedge and colleagues surveyed 149 university students in the United States, India and South Korea.
The researchers asked the students to rate different theories about dreams. Across all three cultures, an overwhelming majority of the students endorsed the theory that dreams reveal hidden truths about themselves and the world.
In another study, the researchers wanted to explore how dreams might influence people's waking behaviour.
They surveyed 182 commuters at a Boston train station, asking them to imagine that one of four possible scenarios had happened the night before a scheduled airline trip: The national threat level was raised to orange, indicating a high risk of terrorist attack; they consciously thought about their plane crashing; they dreamed about a plane crash; or a real plane crash occurred on the route they planned to take.