
The slang term sleeper has a variety of meanings depending on the context in which it is used. In general, it refers to something or someone that appears unassuming or ordinary but has hidden qualities or potential. For example, in the context of cars, a sleeper is a vehicle that looks plain or underpowered but has been modified for high performance. The term can also be used to describe a person who doesn't look like they work out but is actually physically fit or strong. Additionally, sleeper can refer to a spy or saboteur who lives undercover as a typical citizen until activated. In a broader sense, it can also refer to something that becomes unexpectedly successful, like a movie that becomes a surprise hit.
| Characteristics | Values |
|---|---|
| Person | Someone who doesn't look like they work out a lot but is strong and works out |
| Someone who appears non-descript but has hidden abilities or powers | |
| Someone who succeeds when no one thought they would | |
| A spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated | |
| A sleeper agent, an agent or official who doesn't act until they're called upon | |
| A sleeper cell, a small organized group of spies | |
| Object | A car that looks stock on the outside but is putting out some serious power under the hood |
| A sofa, chair, or other piece of furniture that is designed to open up or unfold into a bed |
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What You'll Learn

Sleeper agent
A sleeper, in slang, can refer to a few different things. In general, it describes someone or something that achieves unexpected success. It can also refer to a spy or saboteur planted in an enemy country, who lives as a law-abiding citizen until activated. This second meaning is likely where the term "sleeper agent" comes from.
A sleeper agent is a spy or operative who is placed in a target country or organization, not to undertake an immediate mission, but to act as a potential asset on short notice if activated. Sleeper agents are popular plot devices in fiction, particularly in espionage fiction and science fiction. This common use is directly related to repeated instances of real-life sleeper agents participating in spying, espionage, sedition, treason, and assassinations. For example, Jack Barsky was a sleeper agent planted in the United States by the Soviet KGB and was active between 1978 and 1988.
In fictional portrayals, sleeper agents are sometimes unaware that they are sleepers. They might be brainwashed, hypnotized, or otherwise conditioned to be unaware of their secret mission until activated by a prearranged signal. A team of sleeper agents may be referred to as a sleeper cell, working together in a clandestine cell system.
In online communities, the term "sleeper agent" is also used to refer to fans of indie game developer Project Moon, who will arrive in large numbers almost anywhere if any trigger related to Project Moon is detected.
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Sleeper sofa
A sleeper, in slang, is something that succeeds when no one thought it would. Sleeper can also be used to refer to someone who is asleep. The term is often used to describe something that becomes an unexpected success, like a film that becomes a big hit despite featuring unknown actors.
Now, onto sleeper sofas. Sleeper sofas, also known as sofa beds, are a great way to save space and money. They are typically sofas that can be unfolded or pulled out to reveal a bed. Sleeper sofas come in a variety of sizes, designs, and colors, with both traditional and modern styles available. They are popular among people living in small apartments, parents with young children, and grandparents, as they provide extra sleeping space for guests or family. Sleeper sofas can also be useful for parents of teenagers, as they provide a comfortable place for overnight guests without taking up too much space. Additionally, some sleeper sofas come with built-in storage for bed linens, further maximizing space efficiency.
IKEA, for example, offers a range of affordable sleeper sofas that can easily transform a living room into a cozy bedroom. Their collection includes the LINDÅKRA and SKÖNABÄCK single sleeper sofas, which are space-saving and budget-friendly options. The HYLTARP sleeper sofa from IKEA is also mentioned as a convenient way to accommodate guests.
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Sleeper hit
A "sleeper" is a slang term for something outwardly common or unremarkable that possesses something special or unique. In the context of entertainment, a "sleeper hit" refers to a work that becomes an unexpected success, usually through word-of-mouth. Sleeper hits often slip under the radar during production or are dismissed due to lack of faith from publishers or distributors, but they exceed expectations and gain a dedicated fanbase.
For example, in music, the 1987 single "Welcome to the Jungle" by Guns N' Roses initially performed poorly in the US and the UK. However, as the band's popularity grew, the song became a sleeper hit, reaching the top 10 of the Billboard charts in the US and the top 40 in the UK. Similarly, Lady Gaga's songs "Just Dance" and "Poker Face", released in 2008, did not become popular hits until 2009 in some countries, eventually reaching No. 1.
In film, "The Iron Giant" (1999) was a box office failure due to a lack of marketing from Warner Bros., who did not have faith in the film. However, it received universal acclaim and earned a cult following once it arrived on home video and television, becoming a modern animation classic. "Napoleon Dynamite" (2004) made back its $500,000 budget and grossed almost $45 million within a year, becoming a sleeper hit and spawning an animated series.
Television shows can also be sleeper hits. For instance, "The Superior Foes of Spider-Man" comic book series was originally planned for a 12-issue miniseries, but it became so unexpectedly popular that Marvel extended it.
Even individual people can be sleeper hits. For example, someone might seem unremarkable at first but turn out to be highly skilled or talented in a particular area, surprising those around them.
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Sleeper cell
In slang, a "sleeper" is something that succeeds when no one thought it would. The term is often used to refer to an unexpected success, like a film that becomes a big hit despite having unknown actors. The word may have originated in the world of gambling when a card player unexpectedly drew a winning card and it was called "a sleeper".
The term "sleeper cell" is used to refer to a group of spies, saboteurs, or terrorists planted in an enemy country who live there as law-abiding citizens until they are activated by a prearranged signal. Sleeper cells are often made up of individuals from diverse racial backgrounds and with conflicting personalities.
The American television drama series "Sleeper Cell" explores the concept of a sleeper cell in the context of Islamic extremism. The series, which aired on the Showtime network beginning in December 2005, follows Darwyn al-Sayeed, a 30-year-old undercover FBI agent who is a Muslim himself. Darwyn is assigned to infiltrate a terrorist sleeper cell led by an Arab extremist, Faris al-Farik, who disguises himself as a Jew. The cell is planning an attack in Los Angeles, and Darwyn must navigate the hypocrisy and dichotomy of cell members who claim to be Muslims but engage in behaviours that are considered sinful in Islam.
The series showcases the inner workings of a sleeper cell, where members lead seemingly normal lives until they are activated to carry out violent acts in the name of their cause. In the second season, titled "Sleeper Cell: American Terror", Darwyn infiltrates a new cell that has formed to avenge the defeat of the original cell. The show received critical acclaim and was nominated for an Emmy award for Outstanding Miniseries.
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Sleeper build
In slang, a "sleeper" is something that appears ordinary or unassuming but has hidden capabilities or potential. This term likely originated from the world of car culture, where a sleeper car is an ordinary-looking vehicle that has been modified for high performance. The term has since been applied in other contexts, such as bodybuilding and computing.
A "sleeper build", specifically, refers to an individual who possesses impressive strength and fitness levels that are not immediately apparent from their appearance. In the world of fitness and bodybuilding, a sleeper build describes someone who has a naturally good body without an obvious muscular appearance. They may look scrawny or weak, but when they flex or change into tighter clothing, their toned and muscular physique is revealed. Sleeper builds often have significant muscle mass that is dense rather than bulky.
Achieving a sleeper build requires a specific approach to training and nutrition. It involves prioritizing functional strength and overall athleticism over muscle size. This includes emphasizing compound exercises that work multiple muscle groups simultaneously, as well as consistent, moderate-intensity workouts over sporadic, extreme sessions. Sleeper builds often prefer comfortable and unassuming workout wear that doesn't conform to the typical "gym rat" look.
The mindset of a sleeper build focuses on self-improvement and competing against oneself rather than others. It's about building practical strength and improving athletic capabilities that translate well into real-world activities. Anyone can work towards a sleeper build, regardless of their natural body type, through consistent training and a gradual progression in weights and form.
In the context of computing, a sleeper build PC is one that appears old or cheap on the outside but contains expensive and high-performing components. This term extends the original concept of a sleeper car to the realm of technology, highlighting the deceptive nature of both types of sleepers.
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Frequently asked questions
'Sleeper' is a slang term that refers to someone or something that appears inconspicuous but has hidden abilities or powers. For example, an unassuming-looking car that has been modified to be fast.
The term 'sleeper' likely originated from the phrase 'sleeper agent', which means a spy who lives undercover as a regular citizen until they are activated.
The term 'sleeper' is commonly used in pop culture to refer to someone who doesn't look like they work out a lot but is, in fact, very fit. It is also used to describe a computer that appears old but has high-end specifications.



















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