Dreams are a series of images, emotions or sensations that happen involuntarily in our minds during some stages of sleep. Most of us wonder why we dream about certain things and the meaning behind them. Some civilizations thought that dreams had certain prophetic powers and over the years, scientists have tried to explain different theories of dreaming.
They often occur during the REM stage of sleep. If someone wakes you up right after REM sleep, you will most likely remember what you were dreaming about.