So, the REM Dreamer is a European sleeping mask covering the eyes. It creates light cues like camera flashes, sunlight, car headlights, and other types of stimulants. It is the dreamer’s job to recognize the flashing lights as a dream sign and become consciously lucid by a pre-determined reality check. The sound and light cues are sequenced into the dream so that the dreamer becomes lucid.
Sleep experiments show that during REM sleep, dreamers move their eyes in the same direction as they do in their dreams. In fact, it was Dr Stephen LaBerge who famously did this to scientifically prove lucid dreaming in the 1980s. When lucid, he gave pre-determined eye signals to researchers in the outside world. The point of the experiment and the mask is to help the dreamer remember their dreams better and shorten the time needed to learn lucid dreaming. It’s sold for 147 Euros.