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Strategic napping, the right lighting, a cup of coffee, or just popping a pill? Business Daily's Laurence Knight looks at the many strategies for staying sharp in the office.

Natalie Dautovich of the US National Sleep Foundation explains why smartphones are the enemy, while neuropsychologist Barbara Sahakian discusses the rising popularity of "smart drugs" such as Modafinil and Ritalin.

We also head to the Nats air traffic control centre in Swanwick to find out how workers there keep their focus while handling some of the busiest airspace on the planet.

(Picture: Woman working late in an office drinking coffee; Credit: DragonImages/Thinkstock)