If you’ve had three or more nights of bad sleep in a row, a 400-milligram dose of caffeine, about two strong cups of coffee, won’t help you work smarter, Army researchers find. The caffeine will help after two five-hour nights; beyond that, your body’s buildup of adenosine, a sleep-promoting neurotransmitter, is just too high. (Men’s Health)
If you wake up on the wrong side of the bed and go into work a bit grouchy, your boss should be happy. It turns out that grumpy employees are the most creative problem-solvers, according to researchers from the Jesse H. Jones Graduate School of Management at Rice University in Houston. They say all those happy, cheerful employees that make the office an inviting and enjoyable place to work are so busy smiling they often don’t see problems until there is a crisis. So why is a bad mood so productive? When someone is in a negative mood, he or she is usually quite motivated to get out of it. Solving a problem often does the trick.