Sudden Unexpected Nocturnal Death Syndrome has been experienced through some cultures and people throughout history. Lexi discusses what this syndrome, along with Resignation syndrome, are and what may be causing it from natural causes to mass hysteria.
The following link will also take you to the gofundme that was set up for victims' families from the Buffalo shooting: https://www.gofundme.com/c/act/buffalo-mass-shooting-fundraisers

Cites:
https://www.nytimes.com/1981/05/10/us/nightmares-suspected-in-bed-deaths-of-18-laotians.html

https://www.theatlantic.com/health/archive/2011/09/the-dark-side-of-the-placebo-effect-when-intense-belief-kills/245065/

https://www.history.com/news/nightmare-on-elm-street-real-inspiration-hmong-death

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1647019/

https://commonreader.wustl.edu/swedens-mysterious-sleeping-sickness-psychosomatic-or-coerced/

https://nypost.com/2021/03/31/mystery-of-sleeping-refugee-children-who-shut-down-in-coma-like-state/