Summer heat has a sneaky way of causing problems, especially for older adults. As caregivers, we often assume a sudden change in our loved one's behavior means their dementia is progressing or they're coming down with something serious. Sometimes, though, the answer is much simpler. They may just be dehydrated. As we age, our sense of thirst naturally decreases. Many older adults don't realize they're becoming dehydrated until symptoms are already affecting their body and brain. The good news? Dehydration is often preventable and, when caught early, reversible. Here are 8 warning signs every caregiver should know. 1. Increased Confusion If your loved one suddenly seems more confused, forgetful, or…