Why Do You Get Tired from the Sun? These Are The Seven Reasons

Many of us eagerly anticipate spending more time outside in the warm sun as summer draws near. Whether it’s a day at the beach, a hike in the mountains, or just lounging in the backyard, the sun’s rays can have a profound effect on our bodies. However, you might notice that after a day in the sun, you feel unusually tired. This common phenomenon has several underlying causes. Here are seven reasons why the sun can make you feel exhausted.

1. Dehydration

One of the primary reasons the sun can make you feel tired is dehydration. When you spend time in the sun, your body sweats to cool itself down. Sweating leads to fluid loss, and if you don’t replenish these fluids, dehydration can set in. Dehydration affects your body’s ability to function optimally, causing fatigue and lethargy. To prevent this, it’s crucial to drink plenty of water before, during, and after sun exposure. Electrolyte-rich drinks can also help maintain the balance of essential minerals lost through sweat.

2. Heat Exhaustion

Prolonged exposure to high temperatures can lead to heat exhaustion, a condition that causes extreme fatigue. Severe perspiration, feeling dizzy, nausea, and a fast heartbeat are among the symptoms. Your body works hard to regulate its temperature, and this constant effort can be draining. To avoid heat exhaustion, take breaks in the shade, wear lightweight clothing, and avoid the sun during peak hours. Recognizing the signs early and taking appropriate measures can prevent the condition from worsening.

3. Increased Metabolic Rate

The heat from the sun increases your body’s metabolic rate as it works to stay cool. This means your body burns more energy than usual, which can lead to fatigue. Activities that require physical exertion, such as swimming, playing sports, or even walking, can further increase your metabolic rate. This extra energy expenditure can leave you feeling tired by the end of the day. Ensuring you consume enough calories and staying hydrated can help mitigate this effect.

4. UV Radiation

Ultraviolet (UV) radiation from the sun has various effects on the body, one of which is fatigue. UV radiation can cause oxidative stress, which occurs when there’s an imbalance between free radicals and antioxidants in your body. This stress can damage cells and deplete your energy levels. While sun exposure is essential for vitamin D production, it’s important to protect yourself from excessive UV radiation by using sunscreen, wearing protective clothing, and limiting your time in direct sunlight.

5. Disruption of Sleep Patterns

Exposure to natural light influences your circadian rhythm, the internal clock that regulates your sleep-wake cycle. While sunlight exposure during the day can enhance alertness and mood, too much sun, especially later in the day, can disrupt your sleep patterns. This disruption can lead to difficulty falling asleep or staying asleep, resulting in fatigue the next day. Maintaining a consistent sleep schedule and creating a cool, dark sleep environment can help counteract these effects.

6. Physical Activity

Being in the sun often coincides with engaging in physical activities. Whether it’s swimming, hiking, or playing sports, these activities can contribute to fatigue. Physical exertion, combined with the body’s efforts to cool down, can lead to a significant energy drain. It’s critical to pace oneself, take breaks, and pay attention to your physical needs. Incorporating rest periods and staying hydrated can help manage the physical demands of outdoor activities.

7. Psychological Factors

Spending time in the sun can have psychological effects that contribute to feelings of tiredness. While sunlight can boost your mood and reduce stress, prolonged exposure can lead to sensory overload and mental fatigue. The brightness, heat, and constant stimuli of the outdoors can be exhausting for your mind. Taking time to relax in the shade, practicing mindfulness, and finding quiet moments can help alleviate mental fatigue.

Tips for Managing Sun-Induced Fatigue

Understanding why the sun makes you tired is the first step in managing it. Here are some tips to help you stay energized while enjoying the sun:

1. Stay Hydrated:

Drink plenty of water and consider electrolyte drinks to replace lost fluids and minerals.

2. Take Breaks:

Avoid staying in direct sunlight for extended periods. Find shade or go indoors to cool down.

3. Wear Protective Clothing:

Light-colored, loose-fitting clothes, hats, and sunglasses can help protect you from the sun’s rays.

4. Use Sunscreen:

Apply a broad-spectrum sunscreen with an appropriate SPF to protect your skin from UV radiation.

5. Eat Nutritious Foods:

Consuming a balanced diet with plenty of fruits and vegetables can provide the energy and nutrients your body needs.

6. Listen to Your Body:

Pay attention to signs of fatigue and heat exhaustion. Take breaks as necessary, and try not to overwork oneself.

7. Maintain a Sleep Routine:

Ensure you get enough rest by sticking to a consistent sleep schedule and creating a restful sleep environment.
By taking these precautions, you can enjoy the benefits of the sun while minimizing the fatigue that often follows prolonged exposure.


The sun can be both invigorating and exhausting. While spending time outdoors is beneficial for your health and well-being, it’s important to understand and manage the factors that can lead to fatigue. Staying hydrated, protecting yourself from excessive heat and UV radiation, pacing your activities, and ensuring adequate rest are key strategies to prevent sun-induced tiredness. By following these tips, you can enjoy the sun safely and maintain your energy levels throughout the day.