Nightmares can be unsettling, anxiety-inducting, and sometimes downright terrifying. In addition to the psychological effect, many people also experience physiological symptoms, including sweating or shaking. When you awake from a nightmare, you might be confused and scared, wondering what prompted it. This infographic poses some possibilities. Titled “Interpreting and Translating the Most Common Nightmares,” it offers interpretations for some 11 common nightmares. These include spiders, teeth falling out, being chased, taking a test, being naked in public, being late, being in an out-of-control vehicle, paralysis, falling, drowning or tidal waves, and dying. There’s a scientific reason as well as a popular interpretation given for each dream.