“When the sun begins to set, some chemicals are released to the brain that tells the body that it is time to sleep; when you are at sleep the body rearranges itself for the next day”.

Source: https://realnewsmagazine.net/world-sleep-day-if-you-cant-sleep-find-out-why-neurologist/?utm_source=rss&utm_medium=rss&utm_campaign=world-sleep-day-if-you-cant-sleep-find-out-why-neurologist

When the sun is at its highest, heat reflected off its surface can actually be absorbed by the people and structures nearby.

Source: https://grist.org/project/cities/extreme-heat-resilient-city-design-urban-planning-climate/