People think a lot, but most of that thinking is of a problem, project or situation - not about it

Why do people complain that there's no time to get their work done? Because there is more work to do than the work they think they have to do.

Everything you’ve told yourself you ought to do, your mind thinks you should do right now. Frankly, as soon add you have two things to do stored in your RAM, you’ve generated personal failure, because you can’t do two things at the same time. This produces an all-pervasive stress factor whose source can’t be pin-pointed.

People allow themselves to get distracted; I think ultimately, probably the biggest thing that gets in the way of people doing what they ought to be doing at any point in time is distraction.