
The phrase sleep like a log means to sleep soundly and without moving. The phrase dates back to the mid-16th century in Spain and was also used in Britain around the same time. One of the earliest examples of the phrase in British text is from an article in the Gloucestershire Chronicle on April 12, 1834. The phrase is believed to have originated from the pioneer days in North America when lumberjacks would cut down trees with basic tools, exhausting them by the end of the day.
| Characteristics | Values |
|---|---|
| Meaning | To sleep soundly and without moving |
| Synonyms | Sleep like a top, dormir como un leño (Spanish) |
| Origin | Mid-16th century Spain |
| Earliest recorded usage | 1561, in a Spanish poem by Juan de Timoneda |
| First recorded usage in English | 1808, in The Private Journal of Aaron Burr |
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What You'll Learn

Sleep soundly and unmoving
Sleep is a ubiquitous human activity, and it is no surprise that there are several expressions related to it. One such expression is "sleeping like a log". This phrase is used to describe someone who has slept very well, soundly, and without moving. The phrase is believed to have originated in the mid-16th century in Spain, with the earliest documented usage in English dating back to the early 19th century. The Spanish equivalent, "dormir como un leño", has been found in a text from 1561.
The phrase is a simile that compares the deep, motionless sleep of a person to the perceived immobility of a log. Logs are large, heavy, and do not move unless acted upon by an external force, much like a person sleeping soundly and unmoving. The phrase is often used to describe a person who is exhausted from a long day or hard work and sleeps deeply and peacefully as a result. For example, one might say, "After a long day, I slept like a log."
The expression is also believed to have roots in the early pioneer days of North America when lumberjacking was a common occupation. Lumberjacks would cut down trees and turn them into logs, demanding physical labour. By the end of the day, these workers would be tired and sleep soundly, further reinforcing the connection between deep sleep and the stillness of a log.
While the phrase is primarily associated with sleeping soundly, it is important to note that the phrase has also been used to describe someone who is in a drunken stupor or suffering from a nervous disorder, indicating that the sleep resembled the motionlessness of a log rather than restful sleep.
Today, the phrase is commonly used to express a good night's sleep and is often said with a sense of satisfaction or relief. It is a lighthearted and colourful way to convey the depth and quality of one's sleep.
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Originated in 16th-century Spain
The phrase "sleep like a log" is an idiom, metaphor, and simile that originated in the 16th century. While the exact origin of the phrase is unknown, it is believed to have come from Spain. The earliest known usage of the phrase is in a poem called "Cancionero llamado Sarao de amor" (songbook called [untranslatable] of love) by Juan de Timoneda in 1561. The phrase, translated from Spanish, reads: "he's in bed sleeping like a log".
At this time, mattresses were very different from those of today. They were made from straw or animal hair, such as horsehair or wool, and provided an inviting home for critters and mites. People often woke up having been bitten during the night. Beds were also just starting to be raised above the floor, with wooden frames and a network of rope or leather strips to support the mattress. The tighter the binding, the better the quality of sleep, but the binding would often sag, causing an uncomfortable night's rest.
The phrase "sleep like a log" is likely derived from the nature of a cut log, which will not move unless it is pushed. When a person sleeps so deeply that they don't move, it indicates a very deep and undisturbed sleep. The phrase is commonly used to describe a good night's sleep and can be used sarcastically when one has not slept well.
The phrase began to gain popularity in the early 19th century in English-speaking countries, appearing in print several times in the United States and the United Kingdom. However, it is believed to have been in common use in English since the end of the 16th century or early 17th century. Similar phrases also appeared in other European languages during this time.
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Entered the English language in the 19th century
The phrase "sleep like a log" is believed to have entered the English language in the 19th century, with some of the earliest known usages appearing in print during this period. One of the earliest recorded instances of the phrase in British text dates back to an article in the Gloucestershire Chronicle on April 12, 1834, where it mentions someone "...had slept like a log of wood all night, and that he had not had a wink of sleep."
The phrase also appeared in American sources around the same time. For example, in Aaron Burr's "The Private Journal of Aaron Burr, During His Residence of Four Years in Europe" from 1808, he writes, "Slept like a log till ten, and then was called." Similarly, an anecdote from the Boston Transcript, published in New York in 1830, mentions, "Then he went home and slept like a log."
The phrase likely gained momentum and became popular in English-speaking countries during the early 19th century. While the exact origin of the phrase remains uncertain, it is believed to be derived from the idea of a cut log remaining still and undisturbed unless pushed or moved. This phrase is often used to describe a deep, undisturbed sleep, similar to the stillness of a log.
The phrase "sleep like a log" is considered an idiom, metaphor, and simile, and it is commonly used by both adults and children. It is typically used to describe a good night's sleep, where the sleeper remains undisturbed and does not move, indicating a deep and restful state. The phrase has also been adapted to the present tense, such as "sleeping like a log," to describe someone currently enjoying a peaceful slumber.
While the exact entry of the phrase into the English language is unclear, its usage in the 19th century indicates that it had become a part of common parlance during that time. The phrase offers a vivid and relatable image of sleeping soundly, akin to the immobile nature of a log, and has endured as a popular expression in English to describe a good night's rest.
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Similar expressions in other languages
The idiom "sleep like a log" is used to describe someone who sleeps very soundly and peacefully, without tossing and turning. This expression is believed to have originated in the 16th or 17th century, when mattresses were made from straw or animal hair, providing an uncomfortable sleeping experience. The phrase compares the deep sleep of a person to the immobility of an object, in this case, a log.
- Spanish: "Dormir como un tronco" or "sleep like a trunk" is a direct translation of the English idiom and carries the same meaning.
- French: "Dormir comme une souche" or "sleep like a stump" is another direct translation that conveys the idea of sleeping soundly and peacefully.
- German: "Schlafen wie ein Stein" or "sleep like a stone" implies that the person is sleeping so deeply that they are as immobile and undisturbed as a stone.
- Italian: "Dormire come un sasso" or "sleep like a rock" conveys the same idea as the German expression, comparing the sleeper to an unmoving object.
- Portuguese: "Dormir como uma pedra" or "sleep like a stone/rock" is yet another way to express sleeping soundly and peacefully, without being easily disturbed.
These expressions from different languages all share the same theme of comparing a person's deep sleep to the stillness and immobility of objects, highlighting the peacefulness and undisturbed nature of their slumber.
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Historical sleep conditions
The phrase "sleeping like a log" means sleeping soundly and undisturbed, akin to the deep, quiet stillness of a log on the water.
Throughout history, sleep has been recognised as a crucial aspect of human life, with various cultures and civilisations developing their own unique perspectives and practices surrounding sleep. Here are some insights into historical sleep conditions:
- Ancient Civilisations: In ancient civilisations like Egypt, Greece, and Rome, sleep was often associated with divine or supernatural forces. They believed that sleep was a state of separation between the body and soul, and various gods and goddesses were associated with sleep and dreams. For example, the Egyptians revered the god Anubis, who guided the souls of the deceased during sleep. Sleep environments in ancient times varied, with some individuals sleeping on raised beds or mattresses, while others used pillows and cushions for comfort.
- Medieval Europe: During the Middle Ages, sleep patterns were largely dictated by the sun due to the lack of artificial lighting. People tended to go to sleep soon after sunset and often experienced a period of "first sleep," followed by a period of wakefulness in the middle of the night, and then a "second sleep." This time between sleeps was often used for prayer, reflection, or socialising. Beds were typically shared by multiple family members to conserve warmth and space.
- Renaissance and Early Modern Period: With the emergence of the Renaissance, sleep began to be studied more scientifically. Notable figures like Leonardo da Vinci and Andreas Vesalius made significant observations about sleep and its connection to the brain. Sleep during this era was often disrupted due to infestations of pests like bedbugs and fleas, which commonly found their way into bedding and clothing. Additionally, the concept of privacy and personal space gained importance, leading to the emergence of separate bedrooms for individuals within a household among the wealthy classes.
- Industrial Revolution: The Industrial Revolution brought about significant changes to sleep patterns and habits. The introduction of artificial lighting meant that people could extend their waking hours, often resulting in long work hours in factories with little time for adequate sleep. The living and working conditions during this period were often cramped and unsanitary, further contributing to sleep disturbances and the spread of diseases.
- Victorian Era: During the Victorian era, there was increased interest in sleep and its relation to health and morality. Proper sleep was considered a virtue, as it was believed to be a time for the body and mind to restore themselves. This period also witnessed the invention of the mattress in its modern form, providing sleepers with more comfort and support. However, the practice of "bedding," where multiple people shared a bed due to limited space, persisted among the working class.
- 20th Century and Modern Times: The 20th century saw significant advancements in sleep research and the understanding of sleep disorders. The discovery of rapid eye movement (REM) sleep and the establishment of sleep laboratories revolutionised the scientific study of sleep. Additionally, the widespread use of electric lighting, alarm clocks, and electronic devices greatly impacted sleep habits, often leading to sleep deprivation and disruptions to the natural sleep-wake cycle.
Throughout history, the understanding and conditions of sleep have evolved, shaping cultural practices and beliefs surrounding this fundamental aspect of human existence.
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Frequently asked questions
To sleep like a log means to sleep soundly and unmoving.
The phrase dates back to the mid-16th century, with one of the earliest examples found in a Spanish poem from 1561.
Yes, there are several other phrases that describe sleeping well, such as sleep like a baby and sleep like a stone.
Yes, the phrase varies across different languages and cultures. For example, in Spanish, the equivalent phrase is "dormir como un leño," while in German, people say "wie ein Stein schlafen," meaning "to sleep like a stone."
The phrase is used to describe someone who is sleeping deeply and peacefully, often after a long or tiring day. It may also be used to contrast with a person's usual sleep pattern or to express a desire for improved sleep.























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