Sveta discusses how to monitor stress levels and introduces the concept of heart rate variability (HRV), which measures fluctuations between heartbeats and can be tracked using specialized devices like an Apple Watch. Due to the effects of the sympathetic and parasympathetic nervous systems, HRV tends to increase on happier, more relaxing days and decrease on stressful days. Dr. Silverman explains HRV and how it is a valuable tool for managing stress and overall well-being.