This quote explains why excessive stress leads to burn out

Adopted from the following great quote of David Rock , book named Your Brain at Work..

“A study done at the University of London found that constant emailing and text-messaging reduces mental capability by an average of ten points on an IQ test. It was five points for women, and fifteen points for men. This effect is similar to missing a night’s sleep. For men, it’s around three times more than the effect of smoking cannabis.”