The blow caught him napping.    From Wordnet, Princeton University. 

Verb (used without object) : The question caught him napping.    From Dictionary.com. 

Verb (used with object) : I napped the afternoon away. He naps away most of his classes.    From Dictionary.com. 

Noun : Has the baby had her nap?.    From Dictionary.com. 

The reason I was wrong is, napping is not sleeping.    From Wordnik.com.  [How I Mastered The Power Nap | Lifehacker Australia] Reference

I sometimes only get a couple hours sleep before heading out so napping is often inevitable.    From Wordnik.com.  [When I get in my stand I am WIDE AWAKE. An hour later my eyes get a little heavier.] Reference

The best way I can describe the feeling of napping is that you lie down or sit somewhere, and first focus on relaxing.    From Wordnik.com.  [How I Mastered The Power Nap | Lifehacker Australia] Reference

Emer is napping, which is fabulous, and exactly on schedule, too.    From Wordnik.com.  [Dental hygienists must have really good immune systems] Reference

I've even indulged in napping, which is one of my favorite past times.    From Wordnik.com.  [Archive 2008-04-01] Reference

I’ll be fine and, likely, home by noon and in napping clothes shortly thereafter.    From Wordnik.com.  [I’m not scared. I swear. Really. « Lab Kat] Reference

Not a long nap, but beggars can’t be choosers (napping is not, let’s say, her preferred way to spend her time.).    From Wordnik.com.  [‘Cause motherhood’s gonna require some hard drinkin’… | Her Bad Mother] Reference

Q3SQ2: Do you think napping is effective?.    From Wordnik.com.  [Electric cars interest over one in six Japanese] Reference

Was the press kind of napping in those intervening weeks?.    From Wordnik.com.  [CNN Transcript Oct 5, 2003] Reference

The President has been kind of napping intermittently during the day.    From Wordnik.com.  [Press Briefing By Mike Mccurry From Bethesda] Reference

"Smiling Mickey" Welch plays the point to perfection, and last season caught many men "napping" in this way.    From Wordnik.com.  [Base-Ball How to Become a Player] Reference

Often these "napping" women are doing executive-level things anyway.    From Wordnik.com.  [Taipei Times] Reference

But if we boys could catch the old man King "napping" we would hitch up.    From Wordnik.com.  [Unwritten History] Reference

But recently, they found a kind of "napping" they'd never dealt with before -- gnome-napping!.    From Wordnik.com.  [KOMO - News - Top Stories] Reference

Skagit County sheriff's deputies have seen all kinds of "napping" over the years, from kidnapping to dog-napping, and so on.    From Wordnik.com.  [KOMO - News - Top Stories] Reference

If that's so, the Middle East should be napping now.    From Wordnik.com.  [ARABIAN MIGHT] Reference

Shep was napping beside me and the yelling woke him up.    From Wordnik.com.  [Going Potty] Reference

And it was the only time that Lincoln was caught napping.    From Wordnik.com.  [The Life of Abraham Lincoln] Reference

Basking like a lazy cat napping in a sun drenched window box.    From Wordnik.com.  [Will Durst: Swamp Drainage Detritus] Reference

From time to time, a farmer can be seen napping beneath a tree.    From Wordnik.com.  [Fast Track to Wuhan, China] Reference

A fat tortoiseshell cat napping on a Bed & Breakfast lobby counter.    From Wordnik.com.  [Will Durst: To Doom or Not to Doom] Reference

The plane has enough cabin space for a separate napping room with divan.    From Wordnik.com.  [SPEED OR ELEGANCE?] Reference

The threat of terrorism is real, but America's guardians aren't napping.    From Wordnik.com.  [America Goes On Guard] Reference

And once again, he says, Wall Street's fat cats are napping at the helm.    From Wordnik.com.  [Dan Dorfman: The Curse of the Yen] Reference

But critics are saying as far as being watchdog, this agency was napping.    From Wordnik.com.  [Polishing Toyota's Tarnished Image May Take Time] Reference

Attached to its top was a picture of a napping peasant wearing a sombrero.    From Wordnik.com.  [Most Wanted Kingpin?] Reference

She urges him to start napping after lunch: "" It changed Jack's whole life.    From Wordnik.com.  [Eavesdropping At The Highest Levels] Reference

But the napping policeman can't be bothered to halt the few cars that drive by.    From Wordnik.com.  [NUCLEAR FAMILIES] Reference

I work in a small home office with a napping cat and a large potted plant for company.    From Wordnik.com.  [Which houseplants are best for better air quality?] Reference

 It's closing time and one straggler, a gray-haired man, sits napping in the soft chair.    From Wordnik.com.  [Green Animals] Reference

Voluntary napping, on the other hand, is not a sign of sleep deprivation, illness or aging.    From Wordnik.com.  [Nap Time for Aging Boomers] Reference

Quiet because her stepfather is napping in the bedroom next to ours after having wept all night.    From Wordnik.com.  [Curtains] Reference

After napping on her office sofa, Peggy awakes to a whistle blast from the obnoxious art director.    From Wordnik.com.  [William Bradley: Mad Men : 'The Suitcase' Is Tougher Than Sonny Liston] Reference

Separately, three media companies have outsourced employee napping needs to Yelo, a Manhattan "napping spa.".    From Wordnik.com.  [Magic Number for Happiness: $75,000 a Year] Reference

Also, a pro-napping policy by an employer could be misunderstood as pressure to stay at the office longer into the night.    From Wordnik.com.  [Magic Number for Happiness: $75,000 a Year] Reference

So, that led us to conclude that napping didn't seem to be a substitute for a nighttime sleep in terms of obesity prevention.    From Wordnik.com.  [In Young Kids, Lack Of Sleep Linked To Obesity Later] Reference

Ms. BELL: We found that their napping didn't have any effect on their later obesity, whereas the nighttime sleep was significant.    From Wordnik.com.  [In Young Kids, Lack Of Sleep Linked To Obesity Later] Reference