Gina Johnson
Sleep patterns have changed significantly over the centuries. Our ancestors had very different sleeping habits, with many people believing that the need for eight consecutive hours of sleep each night is universal and has always been essential. However, there is a lot of evidence to suggest that we are not biologically built to sleep in eight-hour blocks. In fact, for thousands of years, humans slept in two shifts, with a period of wakefulness in between. This double sleep or biphasic sleep was the standard way to sleep and only changed with the advent of modern lighting, which allowed people to stay up later. The way people slept also depended on their social status, with the lower classes often sleeping on straw pallets or with only their coats for warmth, while the upper classes had comfortable mattresses and warm nightclothes.
| Characteristics | Values |
|---|---|
| Sleep duration | 6.9–8.5 hours, with sleep durations of 5.7–7.1 hours |
| Sleep patterns | Two shifts with a period of wakefulness in between |
| Sleep onset | 2.5–4.4 hours after sunset |
| Sleep duration variation | Nearly 1 hour between summer and winter sleep |
| Sleep and temperature | Sleep occurred during a period of falling ambient temperature |
| Napping | Relatively rare |
| Sleep and digestion | Linked to digestion, emotion, and stomach |
| Sleep posture | Doctors advised sleepers to rest first on the right side, then turn to the left |
| Sleep and work | The Industrial Revolution changed sleep schedules, consolidating sleep into a single block |
| Sleep and lighting | Electric lighting extended the natural waking period |
| Sleep and socialising | The period of night-time wakefulness was used for socialising and physical intimacy |
| Sleeping arrangements | Families often shared beds; children slept separately |
| Prehistoric sleep | Early humans slept on cave floors, in nests of grass, possibly in the fetal position |
Explore related products
What You'll Learn
Segmented sleep was common
Sleep historian Roger Ekirch and other historians and anthropologists have studied sleep patterns in the pre-industrial era. Their research suggests that segmented sleep was common in medieval times. People would sleep in two shifts, with a period of wakefulness in between. This period of wakefulness usually lasted from around 11 pm to 1 am, and was known as "the watch".
The concept of segmented sleep is mentioned in Geoffrey Chaucer's The Canterbury Tales (written between 1387 and 1400) and William Baldwin's Beware the Cat (1561). During the night-time wakefulness, people would socialise and be intimate with their bedfellows. This period was also used for prayer.
The practice of segmented sleep was not limited to the medieval era. In pre-industrial societies, sleep onset occurred around 3.3 hours after sunset, and people slept during the nightly period of falling temperature. The average sleep duration in these societies was between 6.9 and 8.5 hours, with sleep durations of 5.7 to 7.1 hours.
The transition to a single, long sleep cycle occurred with the introduction of the working day and the concept of private bedrooms. The invention of electric lighting in the 19th century further disrupted natural sleep patterns, as people extended their waking hours beyond sunset.
Sleep Mode: CPU Time Usage?
You may want to see also
Explore related products
People slept on straw
Before the invention of the modern spring mattress in 1899, people used a variety of materials for sleeping, including straw. In the Middle Ages, people slept on mattresses stuffed with straw or rags. Those who could afford it might have feathers in their mattresses. However, not everyone could afford a mattress, and some people slept on the bare ground or on a scattering of heather.
During the medieval period, most people slept communally, often sharing a bed with family members, friends, servants, and even strangers when travelling. To minimise awkwardness, there were strict social conventions around sleeping, such as avoiding physical contact and designated sleeping positions. For example, female children would lie on one side of the bed, with the oldest nearest the wall, followed by the mother and father, and then the male children.
The Industrial Revolution in the 19th century transformed sleep habits. The introduction of artificial lighting, such as gas lighting and later electric lighting, meant that people could stay up later, and the shift towards industrial work meant that sleep schedules became more consolidated. Wealthy elites in the 17th century often slept in four-poster wooden beds with curtains for warmth and privacy.
While it may seem that sleeping on straw would be uncomfortable, our ancestors likely adapted to these sleeping conditions. In fact, some historians argue that the idea of needing eight hours of sleep every night is a modern myth. Studies of traditional peoples who maintain hunting and foraging lifestyles suggest that sleep patterns in the industrialized world are not that different from those of our evolutionary ancestors. These studies found that the people slept on average around six and a half hours, rarely taking naps, and staying awake for a few hours after sunset.
Sleep Pills: Who's Abusing and Why?
You may want to see also
Explore related products
The rich had mattresses
Sleep has long been a topic of fascination. While we often associate a good night's rest with a comfortable mattress, our ancestors had varying experiences depending on their social status and the historical era. The concept of a single, long sleep through the night is relatively modern, and our predecessors often slept in two shifts with a period of wakefulness in between.
In medieval times, the sleeping arrangements of the wealthy stood in stark contrast to those of the common people. While the rich enjoyed the comfort of mattresses, the average person slept on primitive beds or floors, sometimes sharing a bed with their entire family to keep warm. The wealthy, on the other hand, had access to better bedding materials and private bedrooms, enhancing their sleeping experience.
The Industrial Revolution brought about significant changes in sleep patterns and habits. The "sleep is for wimps" attitude emerged, and the working-class increasingly embraced the notion that sleep should be consolidated into a single block to maximize productivity during the day. This shift in perspective was driven by economic factors and the need for efficient labor in factories.
During the medieval era, the practice of biphasic sleep was prevalent. People typically slept for around four hours, woke up for a few hours to pray, socialize, or engage in intimate activities, and then returned to sleep. This period of night-time wakefulness, known as "the watch," fostered a sense of camaraderie and provided an opportunity for casual conversations and physical intimacy that might have been more challenging to achieve during the daytime.
The rich, with their comfortable mattresses, may have had a more pleasant experience during this era. They could retire to their private bedrooms and enjoy the luxury of a good night's sleep, free from the distractions of sharing a bed with multiple people. However, the concept of sleeping all night without waking up is a more recent development, and it wasn't until the 19th century, with the advent of electric lighting, that people's sleep patterns truly shifted away from the biphasic sleep of medieval times.
Doxepin's Sleep Aid Dosage: How Many Milligrams?
You may want to see also
Explore related products
The advent of electricity changed sleep
The advent of electricity had a profound impact on sleep patterns and habits. Before electricity, people often slept in two shifts, a practice known as biphasic sleep. They would go to bed earlier, around sunset, and then wake up in the middle of the night, using this time for prayer, reflection, or social activities. This was a natural sleep pattern that humans followed for centuries.
However, with the arrival of electricity and the Industrial Revolution, sleep habits underwent a significant transformation. The availability of artificial lighting, first with gas and then electricity, pushed back bedtime. People could stay up later, but they still had to wake up at the same time the next morning, reducing their overall sleep duration. The Industrial Revolution's focus on productivity also contributed to this shift, as excessive sleep was increasingly frowned upon.
The advent of electricity also led to the end of biphasic sleep. With the ability to light their homes and streets, people no longer followed the natural rhythm of the sun, and their sleep consolidated into a single cycle. This change occurred first among the urban upper-class groups of northern Europe and then spread across Western civilization over the next two centuries.
The invention of electric lighting and the Industrial Revolution's demands significantly influenced sleep habits, reducing sleep duration and eliminating the natural biphasic sleep pattern. Today, many people struggle with less-than-optimal sleep habits and insomnia due to the pressures of modern life and the always-on nature of electricity and technology.
While electricity brought about significant changes to sleep patterns, it is important to note that other factors, such as societal advancements and the introduction of mattresses and bed frames, have also played a role in shaping how we sleep today.
The Laneige Water Sleeping Mask: A Nightly Skin Treat
You may want to see also
Explore related products
Sleep habits are dynamic
In pre-industrial societies, sleep habits were closely tied to natural factors such as temperature and sunlight. Research on traditional communities, including the Hadza of Tanzania, the San of Namibia, and the Tsimane of Bolivia, revealed that sleep onset occurred during periods of falling ambient temperatures, approximately 3.3 hours after sunset. The average sleep duration in these communities ranged from 6.4 to 7.1 hours, with slightly longer sleep times in winter than in summer.
The medieval era introduced the concept of "two sleeps" or biphasic sleep. People typically slept for around four hours, woke up for a few hours in the middle of the night, and then returned to sleep until dawn or later. This period of night-time wakefulness, known as "the watch," was often used for socializing, intimate activities, or prayer. The practice of segmented sleep was also referenced in medieval literature, such as Geoffrey Chaucer's "The Canterbury Tales."
The Industrial Revolution marked another shift in sleep habits. The emergence of factories and the emphasis on efficient work routines led to a consolidation of sleep schedules. People started aiming for longer periods of uninterrupted sleep, influenced by the notion that "sleep is for wimps." The invention of electric lighting in the 19th century further disrupted natural sleep patterns, allowing people to stay awake longer after sunset.
Today, sleep habits continue to evolve, heavily influenced by modern technology. The prevalence of mobile phones, tablets, and computers exposes us to blue light, which interferes with the production of the sleep hormone melatonin. This disruption to our natural sleep patterns has contributed to the increasing prevalence of insomnia and other sleep disorders.
Understanding the dynamic nature of sleep habits throughout history can provide valuable insights into addressing modern-day sleep challenges and improving our relationship with sleep. By studying the sleep patterns of our ancestors and the factors that influenced them, we can gain a fresh perspective on what constitutes a good night's sleep and develop more effective strategies to enhance our sleep quality.
Machine Sleep: The Future of Rest?
You may want to see also
Frequently asked questions
For thousands of years, humans slept in two shifts, known as "first sleep" and "second sleep". The first sleep began at dusk and lasted for three to four hours. People would then wake up around midnight for a few hours of activity, before going back to sleep until morning.
The waking period was used for various activities such as praying, chopping wood, socialising with neighbours, reading, studying, and sex.
The advent of modern lighting, particularly the invention of the light bulb, changed people's sleeping habits. With the availability of artificial light, people started staying up later, and the second sleep was no longer necessary or possible.
In the past, people slept on makeshift surfaces like piles of straw or grass bedding. As society advanced, primitive mattresses were fashioned out of stuffed fabrics, and bed frames were introduced. The wealthy had access to more comfortable mattresses and beds, while servants and the lower classes often slept on straw pallets or with only their coats for warmth.
