You don't just "feel" older, the subjective response is only a small part of it. Insulin response decreases, and there is a direct relationship between diabetes

You don't just "feel" older, the subjective response is only a small part of it. Insulin response decreases, and there is a direct relationship between diabetes and sleep. Cortisol levels increase, which can harm sleep the following night. Memory and reaction times are measurably worse. We're working on improving the efficiency of deep sleep (https://affectablesleep.com https://affectablesleep.com, https://affectablesleep.com/science https://affectablesleep.com/science).