A: Yes, you can take the measurement at any point in the day, but keep in mind that BioForce HRV is based on looking at how your HRV changes over time. Because of this, it’s important to always try to take it as close to the same time each day as possible. If you take it at 9am one day and 10pm the next evening, your results will not be as accurate because your evening measurement will reflect whatever stress you encountered that day and your fatigue at the point while your morning measurement reflected a more natural rested state. It’s also normal for HRV to fluctuate throughout the day for many reasons so if possible, a morning measurement is the most ideal, but if you must take it at other times, make sure all your measurements fall close to this same time frame as well.