SleepPhones® Harmony featured in Sleep Review Magazine
These Sensor-Studded Headphones Can Sense When You're in Deep Sleep, Trigger Lucid Dreams
By Sleep Review
Generally speaking, when you're in REM sleep, you don't move around at all. So after it learns your sleep patterns, the headband can make an educated guess on when you're in a deep, dream-filled sleep state, and then switch on some music.