HRV big discrepancy between Night readings and morning Health Snapshot

HRV and Health Snapshot is not the same. You can do manually a Health Snapshot and you will see that for Health Snapshot FR965 measures Stress, Heart rate, Oxigen saturation and Breaths per minute.... it is not the same...

I'm talkng about HRV only, and HRV is HRV regardless where you look at itI'm not talking about any other metric from Health Snapshot, just HRV

My (HRV) night readings point to a number that is a WAY below what I see when I do the (HRV) Health Snapshot, like 2 minutes after wake up.

I'm trying to understand why can we have such discrepancy on these 2 numbers.

I agree with you and the exact same thing happens to me. 

There is not necessarily a "big discrepancy" of any discrepancy at all here. One number is a nightly average, and the latter is your morning HRV.

Your HRV will (should) go up as you sleep and recover. If not, a rest day might be needed for your body to deal with the adaptations from your training. 

HRV changes every minute, the night HRV is n average of all your sleep night.

Fernando_Labombarda said:

I'm trying to understand why can we have such discrepancy on these 2 numbers

Here are not 2, but 4 numbers. 1- night average, 2- night 5-min highest, and 3 and 4- your data from the snapshot - "During a Health Snapshot, your Garmin device calculates two different HRV measurements: SDRR and RMSSD". Awakening in the morning is kinda stress that impacts your HS seriously. In short, I don't think that values 1,2 are comparable to 3,4.

For what is worth, i took reading with different devices and garmin is reporting by far the lowest overnight HRV of them all (almost 35ms lower than taking recording witch chest strap overnight). 

Interestingly the snapshot also reports much higher hrv (often 2x as much as what the last point before waking up displays). 

If I could guess, maybe it's because the health snapshot actually puts the wrist sensor into more precise measurement mode? (like when you start activity). 

Health snapshot is a joke. If you check your night HRV chart, it shows a noise graph with a lot of waves and peaks here and there - and that is normal, your HRV changes by every minute, basically every breath you take it changes the HRV (it is different when breathing in or out)

So it literally makes no sense to have anything like "snapshot" when speaking about HRV normally.

There could be exceptions, of course, when your HRV got a big hit, i.e. when you are seriously ill or you are after a HIIT training - but again, even there it makes no sense to measure anything by numbers, because you will feel it and it still could change quickly.

If you want a deep insight in this topic, just download any major HRV app for your phone, and those will dump you tons more, very detailed data and analysis on this.

Just forget garmin's health snapshot - it is just simply as stupid as it can get.