
The word sleeper has a variety of meanings in British English. It can refer to someone who is asleep or a light sleeper who wakes up easily. In the context of gambling, a sleeper is a winning card that was unexpected. It can also refer to a sleeper train or sleeper sofa, which is a sofa that folds out to form a bed. In the automotive world, a sleeper car is an automobile that has been modified for high performance but retains an unmodified appearance. In a similar vein, a sleeper build refers to someone who has an impressive physique but doesn't look like they work out a lot. The term originates from the idea of a sleeper agent, a spy who lives undercover until activated. In entertainment, a sleeper is a movie or other work that becomes an unexpected success.
| Characteristics | Values |
|---|---|
| A person who sleeps | A light sleeper |
| A structural beam in a floor | A railway sleeper |
| A piece of timber, stone, or steel on or near the ground | Sleeper sofa |
| A spy who lives and works for a long time like an ordinary person | Sleeper agent |
| A sleeper build | Someone who doesn't look like they work out a lot |
| Sleeper car |
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What You'll Learn

Sleeper as a noun for a person who is asleep
The word "sleeper" can be used as a noun to refer to a person who is asleep. It can also refer to someone who sleeps well or is a deep sleeper. For example, "I'm a very light sleeper, and I can hardly get any sleep at all." Here, the term "sleeper" indicates that the person is not a deep sleeper and wakes up easily.
The word "sleeper" can also be used in a more figurative sense to describe someone who is inactive or dormant, like a "sleeper agent" or "sleeper cell" in espionage jargon. In this context, a sleeper is a spy or saboteur who lives inconspicuously within an enemy country or group, awaiting activation or a prearranged signal to take action. This sense of the word likely originated from the idea of someone being figuratively "asleep" or inactive until it is time to act.
In addition to referring to a person who is asleep or inactive, the term "sleeper" can also be used in British English to describe something that becomes unexpectedly successful or important after a period of being unnoticed or disregarded. For example, a movie that initially flopped at the box office but became much more popular decades later could be described as a "sleeper hit." This usage may have originated from the world of gambling, where a "sleeper" card is one that is unexpectedly drawn as a winner.
The word "sleeper" has a variety of other meanings as well. In carpentry and nautical contexts, it refers to a structural beam or heavy floor timber that supports a superstructure or keeps railroad rails in place. In the context of railways, a "sleeper" can also refer to a sleeping car or compartment on a train.
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Sleeper as a term for unexpected success
The term "sleeper" is used to describe something that becomes an unexpected success. This usage of the word may have originated in the 19th-century gambling world, referring to a card that a player unexpectedly drew to win the game.
In the context of movies, a sleeper film may feature unknown actors but still become a big hit. For example, a low-tech movie about shark attacks, shot on vacation and edited at home, could be a sleeper if marketed correctly.
In a similar vein, a sleeper can refer to a racehorse that a trainer has tipped to a betting syndicate as a potential surprise winner.
The term "sleeper" can also be used in the automotive world to describe a car that has been highly modified for speed or performance but retains its original, inconspicuous appearance. This could be to avoid attracting attention from the police or opponents in a drag race.
In bodybuilding, a "sleeper build" refers to someone who doesn't appear muscular but is actually very strong and fit. This usage of the term likely stems from the concept of a sleeper agent, a spy who lives undercover as an ordinary person until activated.
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Sleeper as a term for a spy or saboteur
The term "sleeper agent" is used to describe a spy or saboteur who is planted in an enemy country and lives as a law-abiding citizen until they receive a prearranged signal to activate them. Sleeper agents are often ordinary people who live and work among those they are spying on for long periods, remaining unnoticed, ignored, or considered unpromising.
The term likely originated from gambling in the 19th century, where a "sleeper" referred to a card that was unexpectedly drawn as a winner. Over time, the term has taken on a similar meaning in other contexts, such as in film, where a "sleeper" is a movie that becomes an unexpected success.
In recent years, the term "sleeper" has also taken on a new meaning in bodybuilding and automotive contexts. In bodybuilding, a "sleeper build" refers to someone who doesn't appear muscular but is actually very strong. Similarly, in the automotive world, a "sleeper car" is an older or cheaper-looking car that has been modified with advanced internals to make it faster without changing its external appearance.
Overall, the term "sleeper" is used to describe something or someone that appears unremarkable or inconspicuous but has hidden abilities, powers, or importance.
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Sleeper trains and sleeper seats
In terms of accommodation, sleeper trains offer a range of options to cater to different budgets and preferences. Some trains provide basic sleeper seats that convert from seats during the day to beds at night, ensuring passengers can travel and rest in the same compartment. These seats are usually arranged in a 2-tier or 3-tier configuration, with the upper and lower berths folded to create seating space when not in use.
For those seeking more privacy and comfort, sleeper trains often include private rooms or suites. These rooms offer a more exclusive experience, featuring comfortable seating during the day and converting to upper and lower beds at night. First-class accommodations may include dedicated attendants who provide turndown service, assist with meals, and help with luggage. Passengers in private rooms also benefit from complimentary lounge access at major stations, priority boarding, and complimentary meals.
Sleeper trains vary in their design and amenities depending on the region and operator. In India, for example, trains have different classes such as air-conditioned premium classes, budget-friendly classes, and general seating. The Indian Railways system allows passengers to check coach locations and seat layouts using the Trainman app or website, ensuring they are informed about their travel arrangements.
Sleeper seats and trains provide a unique travel experience, combining transportation with the convenience of onboard accommodations. By offering a range of options, from basic sleeper seats to luxurious private rooms, sleeper trains cater to diverse traveller needs, making long-distance travel more accessible and enjoyable.
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Sleeper sofas and other furniture
In British English, the term "sleeper" can refer to someone who is asleep, or it can be used to describe an unexpected success. Now, onto sleeper sofas and other furniture...
Sleeper sofas, also known as sofa beds, are a versatile piece of furniture that serves a dual purpose: seating and sleeping. They are a great option for those who frequently host guests or have limited space. Sleeper sofas typically have a fold-out mechanism that transforms the sofa into a bed, providing a comfortable sleeping area.
When choosing a sleeper sofa, it's important to consider the quality of the frame, cushions, and upholstery. A sturdy frame, such as one made from hardwood, ensures durability and longevity. Dense, high-quality cushions provide comfortable seating and sleeping, and the foam density is an important factor to consider. The higher the foam density, the better the quality of the cushions.
In terms of upholstery, there are various options available, including polyester, genuine leather, and faux leather. Polyester upholstery is commonly used, offering a balance between comfort and durability. Genuine leather provides a luxurious look and feel, while faux leather offers a more affordable alternative with improved scratch and stain resistance.
Some sleeper sofas offer a variety of configurations, allowing you to choose from different mattress types, sizes, and fabric options to customise the sofa to your preferences. It's worth noting that the ease of operation varies between different sleeper sofas, with some being criticised for having fold-out mechanisms that are difficult to use and potentially unsafe.
Sleeper sofas are a convenient and stylish addition to any home, providing both seating and sleeping functionality. With a range of options available, you can find one that suits your aesthetic, comfort, and budgetary needs.
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