If it is true that more young people are dying in their sleep, I doubt that their daily intake of water has changed. Covid and/or vaccines has increased though. Who knows - maybe even wearing masks and isolation makes folks more sick (or dead) when they catch a cold or the flu now. Or increased use of drugs, more fentenal, etc.
Or they just make the news more often now so folks can blame it on the vaccine.
“If it is true that more young people are dying in their sleep...”
Who knows if that is a fact. There are a whole bunch of new variables in everyones’ lives now then when America was still America. The old causation vs correlation conundrum.