Multitasking is a myth. Switching concentration across tasks comes at a neurological cost, depleting chemicals we need to concentrate. We think that we’re doing a whole bunch of things at once. But we’re not actually because the brain doesn’t work that way. A number of studies have shown that what we’re really doing is we’re paying attention to one thing for a little bit of time and then another and then another and then we come back around to the first. So after an hour or two of attempting to multitask, if we find that we’re tired and we can’t focus, it’s because those very neural chemicals we needed to focus are now gone.