While you sleep, HeartGuide™ detects your body movement as described below: 

“Asleep Time” corresponds to Restless Level 0, when you are in deep sleep and it becomes harder to be awakened because your body becomes less responsive to outside stimuli. For more information, please consult your instruction manual. 

“Low Movement” corresponds to Restless Level 1, when your body begins to enter a deep sleep stage. As the body prepares for deep sleep, the body temperature begins to drop and heart rate slows. During this stage, eye movement will slow or stop, and brain wave activity becomes slower, causing less movement. For more information, please consult your instruction manual. 

“High Movement” corresponds to Restless Level 2, which happens during light sleep, when you are more restless as you drift in and out of sleep. In this stage, the eyes move slowly, and muscle activity slows, but you can still be awakened easily. During high movement light sleep, some people may experience sudden muscle contractions preceded by a sensation of falling. For more information, please consult your instruction manual.