Have you ever had a dream in which you realized you were in a dream? If so, you've experienced alucid dream.
What causes lucid dreaming is still not well understood by medical science. For most people, these dreams occur at random and are unpredictable. People also experience varying degrees of control while in a lucid dream. Some people realize they are in a dream but still feel powerless to change the dream's course. Others have reported being able to actively cause the dream to change, sometimes even "rewinding time" in order to send the dream in a more positive direction.
Some people are so fascinated by the possibility of playing in a dream world that they attempt to induce lucid dreaming through various techniques and the use of various devices. Since medical science knows relatively little about lucid dreaming, it's hard to find ways to reliably induce it, and results vary greatly from individual to individual. The most common traditional method is the use of timed cues while sleeping to remind the sleeper they are in a dream. For example, one of the more elaborate devices of this nature is a special mask that blocks out external light while creating light patterns on the inside.
Devices of this nature have been around since the 1970s, but there has been a recent resurgence of interest in lucid dreaming thanks to the development of apps made to assist with it. There are a wide variety of these apps, most of which used timed audio cues.
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