Does extreme heat make one sleepy/tired?

If you've ever nodded off in a hot meeting room, or found yourself quickly falling asleep on a long, warm car journey, you know that heat can make you tired. But why is this? Here are five main reasons heat can make you feel sleepy. read more

A combination of extreme heat and humidity can even kill a human being, let alone make one sleepy/tired. Scientists have been studying what is called, “Wet bulb temperatures”. Wet bulb temperatures take into account the combination of heat combined with high humidity. read more

But when you’re exposed to direct heat while spending time in the sun, your body ends up working overtime to keep you cool. Your heart rate and metabolic rate can increase, too. All this extra physiological effort can make you feel tired or sleepy, even if you’ve just been sitting in the sun. read more

It's not the heat, it's the time. Your Circadian rhythm takes a dip in the early afternoon regardless of whether it's hot out or not. Many cultures in hot climates have a tradition of taking naps in the early afternoon, but this is not directly caused by the heat. read more