Does hot weather make you sleepy?

Does hot weather make you sleepy?

If the warmth of the sun hitting your skin makes you want to take a nap, that’s a sign your body is doing its job – whether it’s protecting you from dehydration, preventing your body from overheating or naturally reacting to sunlight exposure.


“Hot and sunny weather causes your body to lose extra fluids through sweating,” explains Joe Pignotti, a family medicine physician assistant at Aurora Health Care. “If those body fluids are not replenished by drinking water, your body becomes dehydrated.”

Pignotti says this may cause a drop in blood pressure and decreased blood flow to the brain, heart and lungs which can cause fatigue. In severe cases, it can result in death.

“Common initial symptoms of dehydration include thirst, headache, dry mouth or lips, less frequent urination and dark colored urine,” says Pignotti. “Young children and older adults are especially at risk.”


The body already uses energy to maintain a normal body temperature. When your skin is exposed to the sun or you have a sunburn, Pignotti says your body temperature raises, causing your body to use even more energy to cool down.


Exposure to sunlight increases the release of serotonin from the brain. The hormone has many mood-boosting benefits and is essential to the production of melatonin.

“Melatonin is a hormone that regulates your sleep-wake cycle so the increase in serotonin from a sunny day will help you get a better night’s rest,” explains Pignotti.

So, before you head out the door to enjoy the next sunny day, don’t forget to grab a water bottle, apply sunscreen and limit your time outdoors.

Are you trying to find a doctor? Find one in Illinois or Wisconsin. 

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About the Author

Anna Kohler
Anna Kohler

Anna Kohler, health enews contributor, is an external communications specialist for Advocate Health Care and Aurora Health Care. She received her bachelor's degree in public relations from Illinois State University and has worked in health care public relations and content marketing for over five years. In her free time, she enjoys working out, exploring new places with her friends and family, and keeping up with the latest social media trends.