On your sharpest days, you could be getting the equivalent of 40 extra minutes of work done. But those foggy days aren’t just frustrating—they measurably drag down your ability to follow through. Credit: Shutterstock A study from the University of Toronto Scarborough suggests that feeling mentally sharp can significantly boost how much you accomplish in a day. Researchers found that when people are thinking clearly and efficiently, the effect can equal roughly 40 extra minutes of productive