The document describes an innovative lucid dreaming mask called the REM-Dreamer. The REM-Dreamer uses infrared sensors to detect REM sleep and provides light and sound cues to remind the user they are dreaming, allowing them to lucid dream. It consists of a comfortable sleeping mask with a small circuit board that detects REM sleep and gives flashes or beeps as cues. Users can customize settings like flash frequency and duration through an LCD display. The mask is meant to help users experience and control their dreams in a natural way.