Lucid dreaming is nothing more or less than taking control over what happens in your dreams. According to the Lucidity Institute and others, you can be trained to do this.
A dream machine is a tool that may aid some people in doing this. Either a motion sensor or an electro-myelogram (EMG) detects the rapid eye movements (REM) that signal the beginning of dreaming, then small red LEDs blink in front of each eye. Supposedly the blinking red light will be incorporated into your dream, and you'll have hypnotized yourself beforehand to know that a blinking red light means that you're dreaming, and can alter "reality."
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