Does your heart rate drop while you sleep compared to when you are awake? Your body runs on an internal clock called a circadian rhythm. It controls both your activity and rest cycles. This project tracks how sleep changes four key vital signs. You measure four vital signs three times during the day: - temperature - pulse - breathing rate - blood pressure These daytime readings become your baseline. Then a trained partner takes the same measurements while you are in deep sleep. Compare the sleep readings to your daytime averages to see how your body changes at rest.