In 80 clinical trials, Dr. Glenn Wilson, a psychiatrist at King’s College London University, monitored the IQ of workers throughout the day.

He found the IQ of those who tried to juggle messages and work fell by 10 points — the equivalent to missing a whole night’s sleep and more than double the four-point fall seen after smoking marijuana.

In the texting capital of the world, this is news. Not for me: I'm good at ignoring my mobile.