Lucid Dreaming
A lucid dream is when a person dreaming becomes aware that he is dreaming, and is able to influence or control what happens.
There are different types of lucid dreams, such as Dream-Initiated Lucid Dreaming (DILD) which occurs when you are in the middle of a dream and suddenly realize that you're dreaming. Others are reportedly able to go directly from a waking state into lucid dreaming, which is known as Wake-Initiated Lucid Dream or WILD.
Some people believe that lucid dreaming has benefits including increasing creativity and aiding in problem-solving, and providing an opportunity to practice new skills while in a dream state. Lucid dreaming may also be used in a therapeutic manner, such as providing a safe venue to face one's fears and improve confidence by providing an opportunity to practice social skills.