I read so many sci-fi short stories and books from late high school onwards until a couple of decades ago. Some of those scary "it'll never happen" scenarios which were in the dim, distant future are starting to appear in real life, but I can't track the specific book or story I read so long ago for each scenario.

I remember one story where everyone was going about her/his daily life but in actual fact they were all in a semi-comatose state and were living their lives in their mind's eye only. I don't remember the reason for that but I'm assuming it was extreme climate change or something similar. The main character in the story was a young woman living an ordinary life who started to realise all was not as it seemed.