Lucid Dream

A lucid dream is a dream  in which the sleeper is aware that he or she is dreaming. A lucid dreamer can actively participate in and manipulate imaginary experiences in the dream environment. Lucid dreams can seem extremely real and vivid, depending on a person's level of self-awareness during the lucid dream.

The term was coined by the Dutch psychiatrist and writer Frederik van Eeden (1860–1932).

A lucid dream can begin in one of two ways. A dream-initiated lucid dream (DILD) starts as a normal dream, and the dreamer eventually concludes it is a dream, while a wake-initiated lucid dream (WILD) occurs when the dreamer goes from a normal waking state directly into a dream state, with no apparent lapse in consciousness.