So, why does blood pressure tend to spike in the evening? One reason is that our bodies naturally produce more stress hormones like cortisol and adrenaline in the late afternoon and evening. This is because our ancient ancestors used to have to worry about finding food and shelter before nightfall, so their bodies would get a boost of energy to help them get everything done. Nowadays, we don't have to hunt for dinner, but our bodies still follow the same pattern.
Another reason for the evening blood pressure spike is that many of us relax with a drink or two after dinner, which can cause blood vessels to constrict and pressure to rise. It's like when you're at a party and having a great time, but you don't realize how loud the music is until you step outside and notice how quiet it is in comparison. Our bodies can get used to the constant stimulus of the day and then overreact when we finally unwind.
