Productivity studies conducted as early as the 1880s have shown that we can only be productive up to 40 hours a week. Working beyond that will pretty much be counterproductive and you can expect the work you turn over to be subpar.

This question doesn’t even have to be asked, but it nonetheless has to be answered at a time when most companies put a premium on executives who put in more hours at work and stretch their limits by working late nights in the office.

1.     Losing just a night of sleep has been likened to having the cognitive capacity of someone who’s over the alcohol limit. That means your mental processing is a lot slower, not to mention that your senses are not in its optimum state.

2.     When you lose a good night’s sleep, the parietal and occipital lobes of your brain become less active. While the parietal lobe is highly involved in processing information and numbers, the occipital lobe is integral in visual processing. Because of lack of sleep, both parts are slowed down and you will therefore not function as efficiently as you want.

3.     Sleep deprivation will also result in a reduction of glucose in your brain by around 6%.  It’s even worse for the prefrontal cortex, the part that we need for distinguishing what’s good from bad and for social contro. It loses 12% to 15% of glucose.

Sleep deprivation has real impacts, especially if you put a worn out negotiator and executive in the dealing panel. It can cost you some pretty important deals and , ultimately, pay more in overtime work without the results you want.

Read more here.