For the most accurate results, measure HRV right after waking up and before eating or drinking.
Your autonomic nervous system activity fluctuates throughout the day. Consistently measuring HRV every day helps you better track these changes and trends.
Additionally, food, alcohol, and smoking can temporarily affect your autonomic nervous system readings.
Measuring HRV immediately after waking up provides a more apparent baseline. If your wake-up time isn't in the morning, measure HRV right after you wake up, before any food or drink.
Besides your morning HRV measurements, you can also measure HRV the day or before bed. Morning HRV measurements typically reflect your HRV state after a night's rest when stress influence is minimal. Comparing your morning results with those taken later helps you understand how the state of your autonomic nervous system changes throughout the day. Avoid measuring immediately after exercise. Wait until you are calm and your heart rate has normalized for accurate results.
You can record your daily sleep information and morning wellness at any time.
However, measuring HRV and recording daily data together in the morning as a part of the Daily Check-in can help you establish a consistent habit and reduce the chance of forgetting.