Noun : The play was the sleeper of the season.    From Dictionary.com. 

'Wherefore are they called sleepers, but because in the day of the Lord they will be reawakened?'.    From Wordnik.com.  [Expositions of Holy Scripture Second Corinthians, Galatians, and Philippians Chapters I to End. Colossians, Thessalonians, and First Timothy.] Reference

We know that there are so-called sleepers in this country.    From Wordnik.com.  [CNN Transcript Oct 24, 2001] Reference

The sleepers were a long way apart, and the track between frightfully rough.    From Wordnik.com.  [A Maker of History] Reference

The second nightmare scenario involves so-called sleepers smuggled into laboratories by extremist groups.    From Wordnik.com.  [Free Internet Press] Reference

We know the Soviets probably have planted long-term sleepers in the U.S., but obviously we don’t know where.    From Wordnik.com.  [State of the Union] Reference

The steel carrier or "arch" is fixed to one of the sleepers, which is made of sufficient length for that purpose.    From Wordnik.com.  [Scientific American Supplement, No. 1157, March 5, 1898] Reference

AMANPOUR: And do you believe that there are sleepers, the so - called sleepers already embedded in various societies?.    From Wordnik.com.  [CNN Transcript Nov 23, 2001] Reference

But yes, you can have what's known as sleepers inside of a surrendering force or in a civilian crowd, just like in Vietnam.    From Wordnik.com.  [CNN Transcript Mar 23, 2003] Reference

On the Fourth of July, at five o'clock in the morning, the porters called the sleepers out of their berths at Wickford Junction.    From Wordnik.com.  [The Complete Project Gutenberg Writings of Charles Dudley Warner] Reference

One of the horrible sleepers is 9 and the other is 7, 9yo has gotten much better, but I’m still sharing a bed 1/2 time with the 7yo.    From Wordnik.com.  [The Science Of Sleep | Her Bad Mother] Reference

Rautins: The sleepers are the Oklahoma City Thunder.    From Wordnik.com.  [Tsn.ca Top Stories RSS] Reference

Sweet dreams: Snoozers to some are 'sleepers' to others.    From Wordnik.com.  [Fantasy baseball home page] Reference

There was talk of "sleepers" in the slums on the inside.    From Wordnik.com.  [Welcome to the Green Zone] Reference

These "sleepers" would have been the support for that floor.    From Wordnik.com.  [Interactive Dig Mt. Vernon - Dig Diaries: Report 19] Reference

It's why we look so hard to find those "sleepers" on draft day.    From Wordnik.com.  [USATODAY.com - Don't be daft by banking on this draft] Reference

Here are some "sleepers" of 2010, one of them called, appropriately, "The Quiet Book.".    From Wordnik.com.  [Hits, Misses And Sleepers Of 2010] Reference

She said the tapes may contain secret messages to bin Laden "sleepers" to launch new attacks.    From Wordnik.com.  [Method To The Madness] Reference

Obviously with all this exposure as "sleepers" how can any of these players remain "undervalued"?.    From Wordnik.com.  [Jeff Ma: Who Sleeps in Fantasy Football?] Reference

Some of these agents actively engage in subversion; others are "sleepers," prepared to act on call in time of war.    From Wordnik.com.  [FM 100-61 Chptr 9 Artillery Support]

Careful missionary work among these "sleepers" is as productive as spading the ground, and sprinkling a garden patch.    From Wordnik.com.  [The Armed Forces Officer Department of the Army Pamphlet 600-2] Reference

Further, he admitted that he had a number of effective "sleepers" hiding in the U.S. homeland whom he could activate at any time.    From Wordnik.com.  [Peter Lance: Mr. Fitzgerald, In Your Threat to Sue for Libel, Please, Either Put Up or Shut Up] Reference

The Teflon Don or bin Laden's master spy who cut his deal without giving up those "sleepers" he'd told Fitzgerald about in October of 1997.    From Wordnik.com.  [Peter Lance: Al Qaeda and The Mob: How the FBI Blew It on 9/11] Reference

The speech of sleepers is silence.    From Wordnik.com.  [The Breakfast of the Birds, and Other Stories] Reference

Don't forget, in the Art of War you need 'sleepers'.    From Wordnik.com.  [SARA - Southeast Asian RSS Aggregator] Reference

Such is the way that so-called "sleepers" would operate.    From Wordnik.com.  [Latest Articles] Reference

Are you proposing a robot with legs that would step over "sleepers"?.    From Wordnik.com.  [Brad Ideas - Comments] Reference

It was against these "sleepers" that Calvin determined to measure himself.    From Wordnik.com.  [The Great Events by Famous Historians, Volume 09] Reference

I shudder to think just how many 'sleepers' there are in the vital services.    From Wordnik.com.  [Pickled Politics] Reference

Amtrak and in a roomette, you share a bathroom or 3 with all the "sleepers".    From Wordnik.com.  [chicagotribune.com - News] Reference

Of course they have funneled money and personnel into various regions as "sleepers".    From Wordnik.com.  [Biga's Rants - A Townhall.com user blog] Reference

Within the city, "sleepers" have been planted to gather information, and plans call for.    From Wordnik.com.  [The Seattle Times] Reference

Bond-style plot which saw 'sleepers' embedded in American cities, some more than a decade ago.    From Wordnik.com.  [Home | Mail Online] Reference

Hard to detect, they are known as "sleepers", passive assets who feed information back to Moscow.    From Wordnik.com.  [Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph] Reference

"sleepers" to make it to this year's championship game.    From Wordnik.com.  [SI.com] Reference

"sleepers", who would give information when it suited them.    From Wordnik.com.  [ANC Daily News Briefing] Reference