I'm responding in a way that might seem strange at first - but I have a deep concern I can't make sense of. I got a health tracker (Fitbit) for Xmas. I'm trying to improve my overall health, you see. Since putting the device on my wrist, I've noticed the sleep patterns recorded (every night) are sans REM peaks... seems strange? I get heaps of light sleep (according to the readouts) and fewer waking patterns (this seems normal). REM and Deep sleep peaks seem mysteriously absent! Any ideas why this might be?