Heat can exacerbate fatigue and make it more challenging for the body to regulate its internal temperature, which can further contribute to fatigue.

Here's how heat impacts fatigue:

1. Dehydration: When exposed to high temperatures, the body can lose fluids through sweating, leading to dehydration. Dehydration can result in decreased energy levels, impaired cognitive function, and an overall feeling of tiredness.

2. Reduced cognitive function: Heat can impair cognitive performance, including memory, attention, and decision-making abilities. This can lead to increased mental fatigue and decreased alertness while performing tasks, such as driving or operating machinery.

3. Increased physical exertion: In hot conditions, the body needs to work harder to regulate its temperature. This increased physical exertion can lead to more rapid fatigue and a decrease in overall energy levels.

4. Disrupted sleep: High temperatures can make it difficult to sleep comfortably, leading to disrupted or poor-quality sleep. Insufficient restorative sleep can result in daytime fatigue and reduced alertness.

5. Heat stress: Prolonged exposure to high temperatures can cause heat stress, which is characterised by symptoms such as fatigue, dizziness, headaches, and muscle weakness. Heat stress can further contribute to overall fatigue and reduced physical and mental performance.

To mitigate the impact of heat on fatigue, it's important to stay hydrated by drinking plenty of fluids, particularly water, and avoiding excessive caffeine or alcohol. Wearing lightweight and breathable clothing, using fans or air conditioning, and taking regular breaks in cool environments can also help manage heat-related fatigue. Additionally, scheduling physically and mentally demanding tasks during cooler parts of the day can minimise the impact of heat on fatigue.