Simply wear the Spark and let it keep track of your movements. As you move, the Spark will calculate your average motion. Even small movements are constantly monitored by the Spark.
Using two state-of-the-art motion sensors and an internal algorithm, the Spark will know if you fall asleep when your average motion significantly decreases.
The tech that senses your movement.
The science that calculates your motion frequency.
The part that keeps you awake.
The screen that lets you see.
The band that keeps the watch on your wrist.