Welcome to pumpkin-carving, leaf-pile-jumping, see-your-breath fall. While the season comes with some obvious differences from summer, fall also brings about some not-so-evident changes. (And no, we’re not talking seasonal affective disorder.) Check out five ways the season’s about to change you.

1. You’ll get chattier. Just as the nights of fall get longer, so do your phone calls, finds a new study in the journal PLOS One. Researchers at the University of Newcastle studied 1.3 million cell phone users in Portugal and found that in uncomfortable weather—like cold and wet—calls lasted longer and contact lists shrunk. During bad weather, you make the most calls to close friends and family instead of your wider network, researchers found.  

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2. You’ll crave sex. Talk about falling in love. Turns out that autumn is the season of sex, even if the reason’s a little strange. Research shows that once the leaves start to change, our bodies know we’re about to get depressed, so our brains give us an extra boost of dopamine—a “happiness hormone”—that causes romantic thoughts, butterflies in our stomachs, and lots of time between the sheets snuggling.  

3. Your heart will pound. Lower temps cause blood vessels to constrict in an effort to conserve heat, which makes blood pressure rise slightly, according to Jerome Cohen, MD, emeritus professor of internal medicine at Saint Louis University. This could be a big deal if you have hypertension; researchers found that heart attack incidence increases up to 53% in the winter (so avoid doing suddenly strenuous activities like shoveling snow if you have high BP). Check out 13 ways to lower your blood pressure naturally

4. It’ll make you thirsty. When the weather gets cold, the last thing on your mind might be grabbing the water bottle—but it should be. We’re actually more likely to get dehydrated in cold months, since we sub water for diuretics like coffee and tea. A lack of H2O can lead to dry, cracked lips and general lethargy, so make sure to carry your water habit into fall and winter. 

5. Your memory will get a boost. Your brain is actually sharper when it’s nasty out, according to a study published in the Journal of Experimental Psychology. Researchers from the University of South Wales in Australia conducted an experiment at a grocery store where shoppers were exposed to 10 unusual impulse-buy items. The group with the strongest recall of those items was the one tested on cloudy, rainy days—not the sunny, bright-day shoppers.

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Mandy Oaklander

Mandy Oaklander is the former Senior Writer of Prevention.com. She is a graduate of Northwestern University's Medill School of Journalism. Follow her on Twitter @mandyoaklander.