@GuyDudeman oh no, like 95% of it isnt.
It's its own independent psychophysiological response that some people experience and others dont. Same as how some people experience "frisson" from music. So its kind of in an area akin to synesthesia if you're trying to place it.
Studies show its likely dopamine and oxytocin thats being induced and its been shown to help ptsd, depression and insomnia.
They've been trying to figure out if theres a way to induce it in those who dont experience it due to how useful it would be regarding PTSD treatment.