If you feel foggy, yawning at your desk, or drinking too much coffee, you're probably overtired, and it is interfering with your ability to concentrate. Scientists hypothesize that a continued lack of sleep might destroy your brain cells.

A quick fix is to go for a walk outside or to drink a glass of water. But these fixes are no replacement for regularly getting a full night's rest.

When your focus feels depleted, it could be because you are juggling too many tasks.

What you can do about it:

• Start by controlling your environment. Put your phone in another room. Close your email tab. Put headphones in so you don't hea...