If your mind feels foggy, distracted, or mentally exhausted by the middle of the day, you’re not imagining it. What doesn’t help is assuming you just need more caffeine or stronger willpower to stay focused.

If your mind feels foggy, your memory less sharp, or your mood more reactive than it used to be, you’re not imagining it. What doesn’t help is being told it’s just stress, age, or something you have to accept.