Over the past few weeks, as the United Kingdom experienced yet another prolonged heatwave, I found myself struggling to maintain my usual level of productivity. Tasks that typically required moderate effort felt disproportionately demanding. Concentration wavered, decision-making felt slower, and a persistent sense of mental fatigue set in despite adequate rest. I was constantly exhausted, and the familiar comfort of my workspace seemed to offer little respite. Now that temperatures have finally dropped and can finally relax in more temperate conditions, I wanted to investigate whether the research supports what I experienced firsthand: does heat exposure genuinely impair cognitive function, and if so, to what extent? The literature provides a clear answer. Elevated ambient temperatures have been associated with measurable declines in cognitive performance. As global temperatures continue to rise and heatwaves become more frequent, understanding the relationship between heat exposure...