@Ze-Stuart hey, the naps are actually what I slept at night not an actual nap, the body battery Or resources are not really a thing i usually go by how I physically feel. The hrv is for me to know how my body actually handle the “sleep” stress over time to keep planing my sleep alongside taking care of my new born, the HRV is the most important piece of Data you can can during sleep in order to know how you body handle the stress, while you might feel “good” but HRV will give you different picture.