I enjoy my work, but sometimes I have “off days.” You know, the ones where no matter what, I just can’t seem to focus. My brain feels sluggish, and I have to force myself to power through tasks.

Mental sharpness is a term that describes how clear, focused, and efficient a person’s thinking is at a given moment. This efficiency then translates into how easily someone can concentrate, make decisions, set goals, and follow through on tasks. So why are we more “mentally sharp” on some days compared to others?

Recently, the University of Toronto did a 12-week study on their students. They were asked to complete brief, daily cognitive tasks that measured the speed and accuracy of their thinking. The students also provided reports on their goals, productivity, mood, sleep, and workload. This allowed researchers to link mental sharpness directly to everyday outcomes.

Researchers discovered that the difference between our best and worst days of mental sharpness amounts to about 40 minutes of work. They also found that short-term factors such as better-than-usual-sleep and being up early in the morning, influence mental sharpness.

Even though the study looked at university students, the benefits of sleep, pacing one’s day, and emotional well-being contributing to mental sharpness apply to everyone.

By Wendy Yurek