
A sleeper is a term used to refer to a spy or secret agent hired by a state or business to obtain confidential information. The term is also used to describe a person who does not appear to be physically strong or muscular but actually is. In the automotive world, a sleeper car is one that looks and sounds normal but has high performance.
| Characteristics | Values |
|---|---|
| Origin | Gambling in the 19th century |
| Definition | An object or person that is secretly something else |
| Examples | Sleeper agent, sleeper cell, sleeper car, sleeper hit |
| Sleeper agent | A spy who lives and works as an ordinary person until activated |
| Sleeper cell | A small group of spies |
| Sleeper car | A car that has high performance but an ordinary appearance |
| Sleeper hit | Something that becomes unexpectedly successful |
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What You'll Learn

Sleeper agents are spies who live undercover until activated
A "sleeper agent" is a spy or secret agent who lives undercover, posing as a law-abiding citizen, until activated by a prearranged signal. Sleeper agents are often activated after months or years of living undercover, at which point they receive a mission. They may be instructed to enter a specific location and behave normally until activated.
The term "sleeper" is also used more broadly to refer to any object or person that is secretly something else. For example, a sleeper cell is a small group of spies that operates undercover. In the automotive world, a "sleeper" car has high performance but an unassuming or inconspicuous exterior. Similarly, a "sleeper build" refers to someone who appears physically weak or scrawny but is actually very muscular or strong.
The term "sleeper" can also be used in a gambling context to refer to an unexpected winning card. More generally, it can describe something that becomes an unexpected success, like a film featuring unknown actors that becomes a hit.
Overall, the common thread across these various uses of the term "sleeper" is the element of deception or surprise, whether it's a spy living undercover, a car that looks ordinary but is actually high-performance, or a movie that unexpectedly becomes a summer blockbuster.
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Sleeper builds are cars that are fast but don't look it
The term "sleeper" is used to describe a car that is fast yet unassuming in appearance. Sleeper builds typically refer to cars that have been highly modified for increased performance, but without any cosmetic changes that would make them stand out. The goal is to create a vehicle that looks ordinary and inconspicuous, but can deliver exceptional speed and power when needed.
The concept of sleeper builds originated in the automotive world during the 1960s when car manufacturers offered high-performance engines in their base model vehicles. These cars had no cosmetic differences from their lower-powered counterparts, making them sleepers in the true sense of the word. They were popular among enthusiasts who wanted a fast car without the flashy aesthetics typically associated with performance vehicles.
Over time, the definition of a sleeper car has evolved. Today, the term is used more broadly to describe any vehicle that appears unremarkable or mundane but has hidden performance capabilities. This could include cars with stock cosmetics and significantly higher-than-normal power output, or vehicles with subtle modifications that enhance performance without altering their outward appearance.
Sleeper builds are often associated with the element of surprise, as they defy expectations by delivering exceptional performance despite their unassuming looks. This concept of deception and hidden potential is also reflected in the use of the term "sleeper" in other contexts, such as referring to a person with an unexpectedly muscular physique or a computer with high-end specifications housed in an ordinary-looking case.
While sleeper builds may no longer be as common as they once were, they still hold a certain appeal for car enthusiasts who value subtlety and stealth in their performance vehicles. These cars allow owners to fly under the radar while still enjoying the thrill of speed and power.
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Sleeper cells are small groups of spies
The term 'sleeper' is used to describe something that is not what it seems. Sleeper agents, for example, are undercover spies who live as ordinary citizens. The term likely originated in the world of gambling, referring to an unexpected winning card.
The term 'sleeper cell' is often used to describe small groups of terrorists or spies who are planted in an enemy country or organisation. These individuals live quietly and unobtrusively until they are activated to carry out a mission. Sleeper cells can be highly effective due to their covert nature and ability to remain undetected for long periods.
Sleeper cells are a significant concern for security and intelligence agencies due to their potential to cause harm from within. The challenge lies in identifying and infiltrating these cells before they can carry out their missions. Sleeper cells often have a network of support and safe houses, making them difficult to track and neutralise.
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Sleeper hits are unexpected successes
The term "sleeper" has various meanings, including a reference to someone who is asleep or a spy who lives undercover, blending in with the people they are spying on. However, in the context of unexpected successes, a "sleeper hit" refers to something that becomes successful when it was not expected to be. This usage of the term may have originated in the 19th century in the world of gambling. When a card player unexpectedly drew a winning card, it was called a "sleeper."
In the automotive world, a "sleeper" refers to a car that has been highly modified for performance but retains a standard appearance, making it inconspicuous to onlookers, including the police. These cars may have stock cosmetics but feature higher-than-normal power outputs, such as a plain-looking sedan with a high-horsepower engine. Examples include the Buick Regal T-Types from the mid-1980s and the Firebird Formula, which shared attributes with its more expensive Trans Am siblings without the flashy appearance. The 2010 Cobalt SS turbo sedan is also considered a modern sleeper, with its subtle styling and powerful engine.
In popular culture, a "sleeper hit" can refer to a movie that becomes a surprise success, often featuring unknown actors. For instance, a low-budget movie about shark attacks, effectively marketed, could become a sleeper hit. Similarly, in politics, a candidate who was not initially expected to do well may turn out to be the "sleeper" in an election, defying expectations.
The term "sleeper" can also be applied to individuals with unexpected physical strengths or abilities. For example, someone who doesn't appear muscular or "jacked" but is actually very toned and strong would be considered a "sleeper build." This usage originates from the concept of a sleeper agent, a spy who lives undercover, appearing ordinary until activated for a mission.
In summary, "sleeper hits" represent unexpected successes, whether it's in the realm of entertainment, politics, automotive modifications, or individual surprises. The term conveys a sense of something ordinary that reveals a hidden potential or talent, defying initial expectations and capturing attention through its surprising achievements.
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Sleeper can refer to someone who is asleep
The word "sleeper" can be used in an obvious sense to refer to someone who is asleep. The word may have originated in the world of gambling in the 19th century, where a card player who unexpectedly drew a winning card would call it "a sleeper".
In the military context, a sleeper takes on a different meaning. It refers to a secret agent or spy who lives and works undercover, posing as an ordinary person, for a long period of time. These sleeper agents blend in with the people they are spying on and wait patiently for their activation, at which point they receive a mission or signal to carry out their assigned tasks.
In popular culture, the term "sleeper" has been adopted to describe someone or something that appears unassuming or ordinary but possesses hidden talents, abilities, or powers. For example, in bodybuilding, a "sleeper build" refers to someone who doesn't look like they work out but is actually very muscular and strong. Similarly, in the automotive world, a "sleeper car" is a vehicle that looks and sounds normal but has been modified to have high performance or speed capabilities.
In entertainment, a "sleeper" can refer to a movie or other form of media that unexpectedly becomes a success, despite low expectations or a lack of initial fanfare. This usage of the term likely stems from the element of surprise associated with sleepers in other contexts.
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Frequently asked questions
A sleeper agent is a spy who lives and works as an ordinary person among those they are spying on. Sleeper agents are instructed to enter a location and behave normally, sometimes for years, until they are "activated" and given a mission.
Being charged as a sleeper means that you are accused of being a sleeper agent. A sleeper agent is a spy who lives and works as a law-abiding citizen in an enemy country until they are activated by a pre-arranged signal.
The term "sleeper agent" is believed to have originated from the world of gambling in the 19th century. When a card player unexpectedly drew a winning card, it was called a "sleeper".
Some examples of sleeper agents in popular culture include the character Layla Amin in the novel "Walden" by Henry David Thoreau and the movie "The Sleeper" about a spy who becomes an unexpected success.
Being charged as a sleeper can have serious legal consequences, including criminal charges for treason, espionage, or conspiracy. It can also result in imprisonment, fines, or other penalties, depending on the specific jurisdiction and the nature of the charges.














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