I live in a pretty hot climate, but it’s only really unbearable at times due to shoddy building and bad urban planning. Even then, summer can be difficult.
I can’t imagine what it’s like on the equator, especially in dense urban centres. What’s Mumbai, Bangkok, or Singapore like at the height of the wet season?! How do millions of people function day to day?
So like Spain and Italy?
I actually read an article yesterday that stated apparently siestas are are dying thing, as they result in more work and less sleep.
https://edition.cnn.com/travel/spain-late-night-culture-end/index.html