
The phrase forty winks, which means a short nap, can be traced back to Dr. Kitchiner's 1821 self-help guide, The Art of Invigorating and Prolonging Life. The idiom to sleep a wink, on the other hand, is often used in the negative to denote a lack of sleep. For instance, I didn't sleep a wink last night. The phrase a wink of sleep is also used to refer to any sleep at all, even a very brief period of sleep. While the exact time period that the phrase a wink of sleep was used is unclear, the concept of segmented sleep patterns has been observed throughout history, with evidence of its practice during the late Middle Ages and Renaissance, as well as in ancient human sleep patterns before electricity.
| Characteristics | Values |
|---|---|
| Time period | Late Middle Ages and Renaissance |
| Sleep pattern | Segmented sleep or biphasic sleep |
| Time duration | 3-5 minutes |
| Other expressions | Forty winks, sleep a wink, couldn't sleep a wink, a wink of sleep |
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What You'll Learn
- 'Forty winks' was popularised in the 1821 self-help guide, The Art of Invigorating and Prolonging Life
- A wink is the time between blinks, and 40 winks would be 12-16 seconds
- A wink is much longer than a jiffy and about the same as a shake of a lamb's tail
- A wink is 1/100 of a minute, a unit used by industrial engineers before computers
- Segmented sleep was common during the late Middle Ages and Renaissance

'Forty winks' was popularised in the 1821 self-help guide, The Art of Invigorating and Prolonging Life
The phrase "forty winks", referring to a short nap, can be traced back to Dr. Kitchiner's 1821 self-help guide, "The Art of Invigorating and Prolonging Life". The full title of the book is "The Art of Invigorating and Prolonging Life by food, clothes, air, exercise, wine, sleep, &c. and peptic precepts, pointing out agreeable and effectual methods to prevent and relieve indigestion, and to regulate and strengthen the action of the stomach and bowels".
The phrase first appeared in a November 1821 issue of the "British Literary Chronicle", in a review of Kitchiner's book:
> Sleep is a subject on which our author acknowledges his feelings are tremblingly alive; he is fond of a 'forty-winks' nap in a horizontal posture, as the best preparative for any extraordinary exertion, either of body or mind.
The use of quotation marks around "forty winks nap" in Kitchiner's book suggests that he might have borrowed the phrase from elsewhere. However, the earliest recorded evidence of the phrase can be found in the 1821 publication, and it is not present in John Badcock's "Slang: A Dictionary of the Turf, the Ring, the Chase, the Pit, of Bon-ton", printed in 1823. This indicates that the idiom was either too new to have been included in Badcock's dictionary or had not yet been coined.
The origin of the phrase "forty winks" is uncertain, but it may be related to the idiomatic expression "nine winks", which was used in the mid-19th century. Charles Earle Funk, in "Heavens to Betsy!" (Harper & Row, New York, 1955), speculated that the number 40 in the phrase could be a reference to the Thirty-nine Articles of the Church of England. However, this is just one possible explanation among many.
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A wink is the time between blinks, and 40 winks would be 12-16 seconds
The phrase "forty winks" refers to taking a nap for a short period, usually not in bed, or taking a short sleep during the day. It is an English idiomatic noun that can be used in the singular or plural. The phrase "sleep a wink" is used in negative statements to refer to not having slept at all.
A wink is the time between blinks, and the duration of a blink is on average 100–150 milliseconds according to UCL researchers and between 100 and 400 milliseconds according to the Harvard Database of Useful Biological Numbers. If we assume that a one-eyed wink lasts the same amount of time as a two-eyed blink, the duration of forty winks would be 12–16 seconds. However, a wink is technically half of a blink, so a more accurate estimate for forty winks would be around seven to eight seconds.
The phrase "forty winks" originated with sailors, soldiers, or others on watch or long duty without access to a timepiece. One person would nap while the other counted their normal blinks, and after reaching forty, they would wake the sleeping person. The average person blinks 12–16 times per minute, so this would only allow for a 3–5 minute nap, depending on the individual.
In the past, the "wink" was also used as a defined unit of time by industrial engineers before the advent of computers and PDTS. It represented 1/100 of a minute, and decimal minutes made arithmetic easier in time and motion studies.
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A wink is much longer than a jiffy and about the same as a shake of a lamb's tail
The phrase "forty winks" is an English idiomatic noun that refers to a short period of sleep, usually not in bed, or a nap taken during the day. The phrase can be traced back to Dr. Kitchiner's 1821 self-help guide, "The Art of Invigorating and Prolonging Life". In the book, Kitchiner writes that it is better to take a 30-minute nap than to go about one's day feeling tired and unproductive.
The phrase "forty winks" has also appeared in various literary works, such as F. Scott Fitzgerald's 1924 short story, "Gretchen's Forty Winks", and Neil Sedaka's 1960 song, "Stairway to Heaven". Additionally, the phrase can be found in William Langland's 1377 epic poem, "Vision and Creed of Piers Ploughman", where "wynkyng" is used to refer to sleep.
While there is no definitive answer as to the exact duration of a "wink", some have estimated it to be about 300-400 milliseconds, or half the duration of a blink. This would mean that forty winks would only be about 12-16 seconds long. However, others have suggested that a wink is much longer than a jiffy and about the same duration as a single shake of a lamb's tail.
In terms of relative time, a "moment" is considered to be much longer than a "jiffy", a "wink", and a "blink of an eye". A "second" falls somewhere between a "jiffy" and a "moment", but is still much longer than a real second.
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A wink is 1/100 of a minute, a unit used by industrial engineers before computers
The phrase "a wink of sleep" is used to refer to a very brief period of sleep. It is often used in negative statements, such as "I didn't sleep a wink last night," indicating that the speaker did not sleep at all. The phrase "forty winks" is also used to describe a short nap, usually taken during the day or when one should be busy at work.
In terms of quantifying the duration of a wink, it is difficult to assign an exact time frame. Some sources suggest that a wink is the time between blinks, which would be approximately 300-400 milliseconds if we consider a blink to last that long. This would mean that forty winks would be around 12-16 seconds, or a 3-5 minute nap, depending on the individual's blinking rate.
However, it's important to note that the phrase "a wink of sleep" is an idiomatic expression, and the duration of a wink may not be precisely defined. Some people even suggest that a 'moment' or a 'jiffy' is longer than a wink.
Interestingly, the term "wink" has also been used as a unit of time by industrial engineers before the computer era. In this context, a wink is defined as 1/100 of a minute, and decimal minutes were favoured as they simplified arithmetic. This unit of time, though less common today, can still be found on decimal minute stopwatches used for time studies.
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Segmented sleep was common during the late Middle Ages and Renaissance
Sleep patterns have evolved over the centuries, influenced by cultural shifts, migration, and technological advancements. One notable example is the practice of segmented sleep, also known as biphasic sleep, which was prevalent during the late Middle Ages and Renaissance.
During this period, it was common for people to have two distinct rest periods during the night, separated by a peaceful wakeful interval. This interval was not viewed as a disruption to their sleep but rather as an opportunity for various activities. People would engage in prayer, reflection, sexual intimacy, chores, reading by candlelight, or even social visits during this time. This practice of segmented sleep originated in the urban upper-class groups of northern Europe and gradually spread across Western civilization over two centuries.
The concept of "forty winks," referring to a short nap, can be traced back to Dr. Kitchiner's 1821 self-help guide, "The Art of Invigorating and Prolonging Life." In his book, Dr. Kitchiner advised against noodling through the day in a state of fatigue and instead recommended a brief "forty winks nap" in a horizontal posture to prepare for any extraordinary exertion. The number 40, according to Charles Earle Funk, might be related to the Thirty-nine Articles, suggesting that a short nap could interrupt or follow their reading.
The tradition of biphasic sleep began to decline during the late 17th century, coinciding with the emergence of publicly lit streets and electricity. Urban residents became more conscious of time and the potential for productivity during their waking hours. By the 1920s, references to biphasic sleep had completely disappeared from mainstream culture. However, it is worth noting that segmented sleep still persists in certain cultural contexts, such as Mediterranean, Hispanic, and Muslim communities.
While biphasic sleep may not align with the schedules of most individuals in modern society, it offers flexibility and can be beneficial for those with sleep maintenance insomnia. Additionally, the concept of segmented sleep has sparked interest in the sleep medicine world, with some doctors suggesting that this type of rest is the most natural and healthiest for our biological processes.
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Frequently asked questions
Sleeping a wink refers to sleeping for an extremely short period of time.
The phrase "forty winks" can be traced back to Dr. Kitchiner's 1821 self-help guide, "The Art of Invigorating and Prolonging Life".
A wink is much longer than a jiffy and about the same time as a single shake of a lamb's tail. According to one source, a wink is 1/100 of a minute.
Biphasic sleep was common during the late Middle Ages and Renaissance. References to biphasic sleep tapered off during the late 1600s and by the 1920s, all references to biphasic sleep had disappeared.











































