How do I track night terrors using my Apple Watch?

I have seen this on my watch after thanking a friend who called while I was trying to wake myself from a night terror. Fun fact they say you don’t remember the terrors and I am on medication to prevent the terrors because they are vivid but not a nightmare. I don’t think the science is out there since we all are not wearing a watch 24/7 but I got the watch just to see if when I have one it registers something different and oh it did.

[Edited by Moderator]

Original Title: sleep pattern one color