As Cori sits in class, she starts to feel herself dozing off. Which stage of sleep is Cori in?
Heart rate rises and breathing becomes irregular in which stage of sleep?
After De’Ahn falls asleep in class, she is easily awaken by the sound of Kandace’s voice. Which stage of sleep is De’Ahn in?
This stage of sleep shortens as the night goes on, and is characterized by large slow delta waves.