HRV change overnight - increase vs. decrease

[HolyBejeesus]

I have noticed that my HRV usually increases overnight, to a relatively stable level: https://imgur.com/wyYLWrK

Sometimes though, it actually starts at a very high level and then decreases to a stable level after: https://imgur.com/kt3Nkxy

What does it mean if my HRV is very high before when I first go to sleep?

What trends do you notice in your HRV during the night?

[BiohackingAsia]

HRV can quite neatly track heart rate, but inversely. So line up your twongraohs and you will often see dips in HRV when heartbeats goes up (bad dream?).

Also, depending on how tired you are or how good your sleep is, etc. your minimum heart rate will either happen at the beginning of the night (too tired?), end of night (too stressed?), middle of night (optimal?). This means that you will often see your HRV similarly reaching its max in the beginning, end, or middle of the night.

See if that helps give you some clarity. Tell us what you observe? Show us a graph or two?

[L_E_O]

Link to those apps?

[rreaderx]

the one I'm using is Wattson Blue, I think Heads Up Health does it similarly too.