Lucid dream
A dream in which the dreamer knows they are dreaming and may be able to act deliberately.
Also known as: conscious dream
What it means in practice
Lucid dreams and astral projection can share vividness, control and sleep-stage transitions. Some practitioners regard them as different interpretations of the same state; others report consistent experiential differences.
The overlap makes lucid dreaming useful as both a comparison and a possible route into an out-of-body experience.