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Every night, we enter a bizarre world where the laws of physics don’t apply and logic disappears. While we still don’t fully understand why we dream, researchers have uncovered some incredible things about what happens when your eyes close. Here are five facts about the science of dreaming.

• You Forget 95 Percent of Your Dreams: Within five minutes of waking up, half of your dream is forgotten. Within ten minutes, 90 percent is gone. This happens because the brain regions responsible for forming long-term memories are usually inactive during the phase of sleep when dreaming is most intense.
• Blind People Can See in Their Dreams: People who were born blind do not see visual images in their dreams, but they experience high levels of sound, touch, and smell. However, people who lose their sight later in life often continue to see vivid visual images in their dreams for many years.
• You Only See Faces You Already Know: Your brain is not capable of inventing new faces while you sleep. Every person you see in a dream—even if they seem like a stranger—is someone you have seen in real life, even if it was just a brief glance at a passerby on the street years ago.
• Lucid Dreaming is a Learnable Skill: A lucid dream is one where you become aware that you are dreaming while it is happening. Some people can actually train themselves to do this, allowing them to control their actions and even fly or change their surroundings within the dream world.
• Negative Emotions are More Common: Researchers have found that the most common emotion experienced in dreams is anxiety. Negative emotions like fear and sadness show up more frequently than positive ones, which some scientists believe is our brain’s way of practicing how to handle stressful situations in real life.