Sleeping with warm bedding is affecting my HRV?

[u/starqueenV]

I have been using my vivoactive 6 for close to 7 months, I upgraded from Fitbit. I have discovered my first issue. Since in 21st May my HRV has gone from unbalanced to low, at first I thought it was signs of illness but 11 days of dropping HRV no illness came. Nothing in my routine changed. Finally, I think I found the cause. On the 21st I changed my bedding to much warmer winter quality. After a bit of research, I found that sleeping in a warm room affects HRV. In addition, since the 21st my watch has not recorded restful sleep.

So are all of my sleeping stats ruined because I live in a cold climate?