Hit a Lull in Productivity? Blame Circadian Rhythms

Have you ever noticed that you hit the wall at work around the same time every day? It's not just because you had a big lunch, or didn't get enough sleep last night. Some times of day are just better for productivity than others. It might have to with our circadian rhythms. Read on to see what times of the day your body and mind are most alert, and when you just need to call it quits.