Well, I dont want to BASH the product, but in my period of testing, I didnt feel that REM was getting detected. The ad says it added Facial Movments (i.e twitching) and REM detection. I turned of switch 4 (this removes the 40min delay) and put the mask on. I kept my eyes close then moved them around and around back and forth and no queue. However, it will pick up “Eye Fluttering”, (open and closing of the eyes very fast). I was actually having a lucid on my own (wearing the mask) and in the dream I saw nothing (no cues that would possibly be lights, and NO sound (I turned on the alarm). All this is in my testing and my opinion and – I am interested in hearing other reviews.
From the AD:
So what we did was to add another way to detect REM. It turns out that Electromyography (EMG) which measures facial tension is another good way to determine REM. By combining these two methods as we have done, increases the reliable detection of REM.
In short, I dont think facial twitching alone will let you know your dreaming. And why did he put ONE sensor when you have TWO eyes? That doesnt make sense either. I ended up selling it because it didnt meet my satisfaction.