Google’s expanded Kirkland office features “nap caves” — and workday napping is gaining adherents at companies around the country.

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At Google, there’s no need to guzzle espresso to hit deadlines. The tech company’s Kirkland office features “nap caves” for employees who need to rest and recharge, one of the amenities the company dangles to prospective employees.

Napping at work is having its fashionable moment. Work nap pods have become a cottage industry. Given the volume of news stories devoted to workplace napping, journalists across the country must be particularly enamored of the in-office snooze (or maybe it’s because they’re overworked and sleep deprived?).

Do workday naps really improve productivity and well-being?

Yes, in theory, according to most reports.

“Science knows that the midday snooze produces all kinds of benefits, including improved memory, increased alertness, and decreased mistakes,” reports Bloomberg.

In practice, the Bloomberg reporter extolling the virtues of napping, Rebecca Greenfield, found it more difficult to get some shut eye.

Despite testing several nap-aiding gadgets over a week, she reported that she was not able to get to sleep in the office, though she did feel somewhat refreshed.

How should you nap?

CNN compiled advice from doctors, who suggested quick power naps.

“Twenty minutes or less is the rule, unless you’re really dragging, in which case you should get about 90 minutes of shut-eye,” the network advises.

ABC News suggests hitting the “prime nap time” of 1 to 3 p.m., when your body’s energy naturally dips.

Beyond those general outlines, there doesn’t seem to be much consensus on the value of workplace naps, except that they garner good publicity for companies that offer them.