Gina Johnson
Biphasic sleep is a sleep pattern where a person sleeps in two segments per day. It is also referred to as bimodal sleep or segmented sleep. This sleep pattern was common before the industrial era and the invention of the lightbulb, which allowed people to stay awake longer and work more. Today, biphasic sleep is still common in some societies and cultures, such as in the Mediterranean, Middle Eastern cultures, and Latin America, where people take afternoon naps called siestas. Some people also adopt biphasic sleep schedules to maximize their productivity and improve their energy and brain function. However, there are potential downsides to biphasic sleep, including the risk of sleep deprivation and difficulty adjusting to conventional work or school schedules.
| Characteristics | Values |
|---|---|
| Description | A sleep pattern with two segments or phases per day |
| Historical Evidence | Biphasic sleep was likely a typical sleep pattern for humans hundreds to thousands of years ago |
| Benefits | May improve energy and brain function, reduce stress, and increase alertness |
| Potential Drawbacks | Sleep deprivation, not feasible for everyone, potential for poorer sleep quality |
| Who It May Work For | People who work night shifts, people in hot climates, people with cyclical work, social or religious schedules |
| Tips for Transitioning | Consult a doctor, choose a pattern that fits your lifestyle, maintain consistency, set an alarm |
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What You'll Learn
Historical evidence of biphasic sleep
Biphasic sleep, or sleeping in two distinct periods over a 24-hour span, has a rich history dating back to ancient civilizations. While the modern world has largely shifted to a monophasic sleep schedule with a single block of nighttime sleep, biphasic sleep was the norm for a significant portion of human history.
Ancient Civilizations
The ancient Egyptians, as far back as 2000 BCE, are often credited with being the first civilization to adopt a biphasic sleep pattern. They would sleep for four to six hours at night, wake up for a period of leisure activities, and then return to sleep for another four to six hours. This practice was also observed by the Romans, with the historian Livy possibly being a practitioner of biphasic sleep, alluding to the method in his work, "The History of Rome."
Medieval Period
Biphasic sleep was not unique to a specific region or culture and was widely practised throughout the pre-industrial world. In France, the initial sleep was called the "premier somme," while in Italy, it was known as the "primo sonno." Evidence of this sleeping pattern has been found in diverse locations, including Africa, South and Southeast Asia, Australia, South America, and the Middle East.
Industrial Revolution
The transition to a more standardized monophasic sleep schedule occurred during the early modern period, influenced by the Industrial Revolution. The rise of factories and the need for a consistent workforce contributed to the shift. Additionally, the belief that biphasic sleep indicated laziness and a lack of discipline further propelled the move towards a single block of nighttime sleep.
Historical Research
Historian A. Roger Ekirch's research provides valuable insights into the prevalence of biphasic sleep in pre-industrial societies. He draws evidence from numerous references to segmented sleeping patterns in documents from ancient, medieval, and modern times. Ekirch suggests that the introduction of electric lighting in modern times has contributed to the decline of interrupted sleep patterns.
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Benefits of biphasic sleep
Biphasic sleep, also known as bimodal sleep, is a sleep schedule that involves two periods of sleep over 24 hours. This usually consists of a longer sleep at night and a nap during the day. While biphasic sleep is less common than the monophasic sleep schedule, it is still prevalent in cultures that take siestas (midday naps).
Increased Total Sleep Time
Biphasic sleep can help increase total sleep time for those who are prone to not getting enough sleep. This can be especially useful for people who work night shifts or have sleep deprivation due to a sleep disorder or other disturbances.
Improved Energy and Brain Function
Research shows that biphasic sleep schedules with a short midday nap and a long nighttime sleep may help improve brain function and energy levels. A study of 23 young adults found that 30-minute afternoon naps improved participants' brain speed when completing memory tasks.
Avoidance of Intense Sunlight and Heat
People living in hot climates may benefit from biphasic sleep schedules to help them avoid intense sunlight and heat in the middle of the day.
Improved Alertness and Productivity
Many people who follow a biphasic sleep schedule report feeling more alert and getting more done throughout the day.
Stress Relief
For some people, embracing a middle-of-the-night wakeful period can dial down stress and anxiety. This can be especially helpful for women experiencing sleep disturbances related to perimenopause.
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Drawbacks of biphasic sleep
While biphasic sleep may be a natural sleep pattern for some, it is not without its drawbacks. Here are some disadvantages to consider:
Potential Health Risks
Some studies have linked napping, a key component of biphasic sleep, to an increased risk of cardiovascular disease, falls, and cognitive decline in older people. Additionally, napping for longer than 30 minutes can lead to a state of confusion and grogginess upon waking up, known as sleep inertia. This can leave you feeling less than your best and may not provide the restorative rest you need.
Incompatibility with Modern Work Schedules
The modern industrial workday, influenced by the expansion of artificial light, has largely shifted towards an 8-hour monophasic sleep schedule at night. Biphasic sleep, with its two segments, may not align with the demands of modern work schedules and could potentially impact productivity and overall daily functioning.
Disruption of Circadian Rhythm
Shifting to a biphasic sleep schedule can be challenging and may not suit everyone's circadian rhythm. It requires a consistent routine, timing of light exposure, and good sleep hygiene practices. Caffeine consumption, exercise routines, and bedtime rituals can all impact the success of adopting a biphasic sleep pattern.
Lack of Research on Long-Term Effects
While there is some research suggesting potential benefits of biphasic sleep, such as improved alertness and thinking, the long-term effects of this sleep pattern are not yet fully understood. More research is needed to determine the potential health consequences, both positive and negative, of adopting a biphasic sleep schedule.
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Modern-day relevance of biphasic sleep
Biphasic sleep, a sleep pattern where a person sleeps in two segments per day, is still relevant in the modern day. While most people follow a monophasic sleep pattern, involving one continuous sleep period, biphasic sleep is still common in some societies and cultures. For instance, it is still found in certain Middle Eastern cultures, Latin America, and the Mediterranean, where people take afternoon naps or siestas. In addition, people who work night shifts or have sleep disorders may benefit from biphasic sleep to avoid sleep debt and ensure they get the recommended amount of sleep.
The relevance of biphasic sleep today may be due to several factors. Firstly, it can be a practical solution for those with cyclical work, social, or religious schedules. For example, those who work in the evenings or at night may benefit from a short midday nap to improve their focus and energy levels. Secondly, historical and ancestral sleeping patterns suggest that biphasic sleep may be more natural for humans. Research supports this, indicating that biphasic sleep can improve alertness, cognitive function, and energy levels. Short naps of 20-30 minutes boost energy and alertness, enhance thinking and reasoning abilities, and avoid sleep inertia or grogginess upon waking.
However, the feasibility of biphasic sleep in modern times is questioned due to potential drawbacks. One concern is the risk of sleep deprivation if the total sleep across the two segments is insufficient or if the nap segment interferes with nighttime rest. This could lead to negative health consequences, such as an increased risk of heart or kidney disease, diabetes, and depression. Additionally, cultural attitudes, particularly in North America, can make it challenging to find time or spaces to nap during the day. The expansion of artificial light and modern work schedules has also contributed to the decline in biphasic sleep patterns, as people can stay awake longer and work extended hours.
Despite these challenges, biphasic sleep remains a viable option for some individuals in the modern day. It can be particularly beneficial for those who need flexibility in their schedules, such as caregivers or those with irregular work hours. By splitting their sleep into two sessions, individuals can better manage their energy levels and productivity throughout the day. Furthermore, the practice of napping is culturally prevalent in some societies, and it provides a way to escape intense heat during the hottest parts of the day.
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Transitioning to biphasic sleep
Biphasic sleep involves sleeping in two segments per day, usually a midday nap and a longer nighttime sleep. The length of these sleep segments can vary, with some people taking long midday naps of one hour and sleeping 5-6 hours at night, while others take short midday naps of 20-30 minutes and sleeping 6-7 hours at night.
If you want to transition to biphasic sleep, it is recommended to first decide on a specific biphasic sleep schedule that you want to try. You should also consider talking to your doctor, as they can offer advice and recommendations for improving your sleep quality and daytime energy levels.
To successfully transition to biphasic sleep, it is important to create a consistent schedule. This means taking your nap at the same time every day, preferably between 12:30 pm and 3:00 pm, and keeping your naps under 30 minutes to avoid sleep inertia. Timing your light exposure and practicing good sleep hygiene are also important factors in maintaining a successful biphasic sleep schedule.
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Frequently asked questions
Biphasic sleep is a sleep pattern where a person sleeps in two segments per day. This could be a combination of a nighttime sleep phase and a nap at another time during the day, or two nighttime sleep phases with a break between them.
Research shows that biphasic sleep schedules with a short midday nap and long nighttime sleep may help improve brain function and energy levels. Short naps under 30 minutes are known to boost energy and alertness, and improve thinking and reasoning. It can also help people who don't sleep enough at night, including those who work night shifts or have sleep disorders, to avoid sleep debt.
Some researchers argue that biphasic sleep is not natural but influenced by factors like our eating habits, social schedules, and hot afternoon temperatures. It is also not feasible for everyone, such as caregivers or those with strict work schedules. The biggest issue is the potential for sleep deprivation due to poor sleep quality and insufficient sleep overall.
