In the Hollywood blockbuster Inception, people can control dreams at will. And in real life, this is not impossible. For more and more of us, it has become a reality. Now, the number of people who have experienced lucid dreams is growing rapidly. A lucid dream refers to a dream where you know you're dreaming, and when you realize you're in a dream, you can change it. Through practice, you can even reach a level of complete control over your dreams.