What exactly are dreams?

Dreams are a release of energy in the brain during REM sleep. *There are many examples of dreams that seemed to predict future events. Some may have been due to coincidence, faulty memory, or an unconscious tying together of known information. A few laboratory studies have been conducted of predictive dreams, as well as clairvoyant and telepathic dreams, but the results were varied, as these kinds of dreams are difficult to study in a laboratory setting.