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A battery powered one would be adequate for what I presume is the primary application, a problem that stretches back millennia. And cheaper than hosting a wake.

https://www.ancientpages.com/2016/02/09/strange-history-of-s...

I'm way too old to have finally realized what they mean by "wake".

Not all the way to the coffin, but just the other day I saw a news report of EMTs calling time on a patient with no pulse who is in fact still alive today.

People still occasionally wake up in morgues and funeral homes. Rare but it happens, though often only a very temporary reprieve.

https://www.cnn.com/2023/02/07/us/new-york-woman-found-alive...

Your post prompted me to look into it, as I'd not made that connection either.

However Wikipedia says that's not the case and "a wake for the dead harks back to the vigil, "watch" or "guard" of earlier times. "

https://historycollection.com/buried-alive-common-victorian-...

To provide early warning in case someone does make it back from the other side?

Like you also see referenced in the sibling comment - yes, some people indeed come back. And it is probably not funny, if you come back to life, but find yourself buried alive.