The REM Dreamer uses infrared sensors to detect when you are in dreaming (REM sleep) and uses lights and sounds to make you aware that what you are experiencing is a dream.
The REM-Dreamer kit comes with a very comfortable sleeping mask with a small printed circuit board tucked inside that detects REM sleep, giving cues in the form of flashes or beeps. The kit also includes an LCD display device, which allows the user to adjust all settings very easily