 You can also take a cold shower or put a cold washcloth on your forehead. This is going to instantly help with the cognitive symptoms that you may be experiencing during heat waves, such as focus and attention. Places that don't have an AC, it's a lot tougher for them to cool down, even when it gets dark. It's also according to hospital services and the healthcare industry. It's also not uncommon to see more ER visits during heat waves as well. That's Mo Heider reporting.