Gina Johnson
Biphasic sleep is a sleep pattern that involves two periods of sleep over 24 hours, usually consisting of nighttime sleep and a midday nap. While monophasic sleep, or sleeping in one block, is the most common sleep pattern, biphasic sleep was more prevalent before the industrial era. Some people adopt biphasic sleep schedules to improve productivity and energy levels, but it may not be suitable for everyone. Research on the health benefits of biphasic sleep is limited, and it is important to prioritize quality sleep and consult a physician before making significant changes to sleep patterns.
| Characteristics | Values |
|---|---|
| Definition | A sleep pattern involving two periods of sleep over 24 hours, usually a longer night-time sleep and a shorter nap during the day |
| Other Names | Bimodal, diphasic, segmented, divided, siesta sleep |
| History | More common before the industrial era when artificial lighting became widely used |
| Current Prevalence | Less common than monophasic sleep but still prevalent in cultures that take siestas |
| Benefits | May improve energy, alertness, cognitive function, productivity, and overall health |
| Risks | Sleep inertia, negative impact on sleep quality, potential health risks due to lack of sleep and irregular sleep patterns |
| Tips for Adopting Biphasic Sleep | Stay consistent, nap during midday, set an alarm, try a caffeine boost, set up your space |
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Historical precedent
Biphasic sleep, or the practice of sleeping in two distinct periods over the course of 24 hours, has a long history dating back to ancient civilizations. For much of human history, biphasic sleep was the norm, with people sleeping for approximately four hours early in the night, then waking up for an hour or so, before returning to sleep for another four hours.
Anthropologists and historians have described biphasic sleep patterns in many societies, from Nigeria and Brazil to Scandinavia and England. It was also widely practised throughout the preindustrial world, with evidence of the habit found in locations as distant as Africa, South and Southeast Asia, Australia, South America, and the Middle East.
Biphasic sleep was also common in ancient civilizations, with the ancient Egyptians often credited as the first civilization to adopt this pattern, with evidence dating back to at least 2000 BCE. The Egyptians would sleep for four to six hours at night, then wake up for a period of rest or leisure activities before returning to sleep for another four to six hours. This pattern was described by the Roman historian Plutarch, who wrote that the Egyptians "interpose a set of leisure hours between the two periods of sleep." Biphasic sleep was also common in ancient Greece, where it was known as "first sleep" and "second sleep."
In medieval times, references to biphasic sleep can be found in works of literature, such as Geoffrey Chaucer's The Canterbury Tales (written between 1387 and 1400). Colonial accounts from the 16th and 19th centuries also describe the practice of biphasic sleep in Brazil and Oman, respectively.
The decline of biphasic sleep began during the Industrial Revolution, as artificial lighting became more prevalent, and people started to adopt the modern industrial workday. However, biphasic sleep still lives on in pockets of the world today, particularly in certain Mediterranean cultures, such as Spain, Italy, and some Latin American and Middle Eastern countries, where afternoon naps or "siestas" are common.
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Health benefits
Biphasic sleep refers to a sleep schedule where a person sleeps for two segments per day. This usually involves a midday nap and a longer nighttime sleep.
- Improved cognitive performance and brain function: Midday napping has been consistently linked to improved cognitive performance. Shorter naps of 20-30 minutes can boost energy and alertness, improve thinking and reasoning, and enhance memory and thinking skills.
- Increased total sleep time: Biphasic sleep can help individuals prone to not getting enough sleep to increase their total sleep time. This includes people working night shifts, those with sleep disorders, and those living in hot climates who may want to avoid the intense midday heat.
- Improved physical health: Napping has been associated with improved physical health. A large study of Mediterranean adults found that those who took 30-minute siestas were 21% less likely to have high blood pressure than those who didn't nap.
- Improved mental health: Napping can also positively impact mental health. It can help alleviate sleep deprivation, improve mood, and reduce fatigue.
While these potential health benefits exist, it is important to note that research on biphasic sleep is limited, and individual results may vary. Some people may find that biphasic sleep does not improve their restfulness and may need to stick to a monophasic sleep schedule. Additionally, it is crucial to prioritize getting sufficient, quality sleep, regardless of the sleep pattern chosen.
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Energy and alertness
Biphasic sleep, also known as "siesta sleep", involves two periods of sleep over 24 hours, typically a longer period of sleep at night and a shorter nap during the day. While monophasic sleep is the most common sleep pattern today, there is historical evidence that humans used to naturally follow a biphasic sleep schedule.
Biphasic sleep schedules with a short midday nap and long nighttime sleep may help improve energy levels and alertness. Short naps under 30 minutes are known to boost energy and alertness, while avoiding wake-up grogginess or sleep inertia. This is because short naps help improve receptors in the brain that are responsible for reducing sleepiness and improving thinking and reasoning. Research has also shown that naps can offer benefits to cognitive function, alertness, and performance.
Napping for longer than 30 minutes may make you feel more tired and groggy, as you risk falling into a deep sleep and experiencing sleep inertia when you wake up. However, an extended siesta of 90 minutes allows a person to have one complete cycle of sleep.
If you are interested in trying a biphasic sleep schedule, it is important to maintain consistency by sleeping and napping at the same time every day. It is also recommended to consult a doctor or sleep expert to decide if biphasic sleep is the best option for you.
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Productivity
Biphasic sleep refers to a sleep schedule where a person sleeps for two segments per day. This may be two nighttime sleep phases with a break between them or a longer sleep phase at night followed by a shorter nap during the day.
The biphasic sleep pattern is believed to boost productivity, and this is largely due to enhanced cognitive function and increased alertness. Research suggests that sleeping twice in a 24-hour period may improve cognitive function, which may be partly because it reduces feelings of tiredness and enhances the capacity for focus and concentration. This increase in productivity is not accompanied by a greater sense of tiredness or burnout.
The biphasic sleep pattern is believed to be more in line with the natural sleep patterns of our ancestors, as well as with the sleep patterns of many animals. Before the industrial era, biphasic sleep was common across different cultures and continents. People would go to sleep with the sun, wake up for a while in the middle of the night, and then return to sleep. The introduction of artificial lighting enabled people to stay up past sunset, and monophasic sleep became the dominant sleep pattern.
Some people might naturally follow a biphasic sleep schedule, and it can also be adopted intentionally to maximise productivity. However, it is important to note that biphasic sleep is not for everyone, and transitioning to a new sleep schedule involves an adjustment period. During this time, some people may experience feeling more tired, groggy, or grumpy. Additionally, shaking up your sleep schedule may disrupt your current social dynamics. For example, napping in the afternoon might cause conflicts in your office.
If you are considering adopting a biphasic sleep schedule, it is important to follow good sleep habits to ensure you are getting the right amount of quality sleep. This includes creating a consistent schedule, timing your light exposure, and practicing good sleep hygiene.
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Consistency
Biphasic sleep, by definition, involves two periods of sleep within a 24-hour cycle. This typically includes a longer period of sleep at night, followed by a shorter daytime nap. To effectively adopt this sleep pattern, it is recommended to establish a consistent routine by napping at the same time every day. Maintaining a fixed nap time ensures that your body adjusts to the biphasic rhythm, promoting better overall sleep quality.
The ideal nap time for biphasic sleep is generally considered to be between 12:30 pm and 3:00 pm. Keeping naps within this timeframe helps prevent interference with your nighttime sleep while still providing the benefits associated with biphasic sleep. Additionally, it is advisable to limit naps to 20-30 minutes to avoid sleep inertia, which can leave you feeling groggy and less alert upon waking up.
While biphasic sleep may not be suitable for everyone, those who choose to adopt this sleep pattern can maximize its potential benefits by maintaining a consistent daily schedule. This includes not only regularity in nap timing but also in other aspects of sleep hygiene, such as limiting caffeine intake and creating a relaxing bedtime routine to promote optimal sleep quality during both phases of biphasic sleep.
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Frequently asked questions
Biphasic sleep involves sleeping twice in a 24-hour period, usually with a longer period of sleep at night and a shorter nap during the day.
Some people find that biphasic sleep improves their energy levels, alertness, cognitive function, and productivity. Research has also shown that short naps of 20-30 minutes can improve brain function and reduce sleepiness.
Biphasic sleep may not work for everyone. Some people may experience sleep inertia, which is when you feel groggy and less than your best after waking up. It can also be difficult to maintain a consistent schedule, especially in cultures where monophasic sleep is the norm.
If you want to try biphasic sleep, it's important to prioritize getting enough quality sleep. Keep your nap times consistent, and aim for a midday nap between 12:30 and 3:00 PM. Limit your naps to under 30 minutes to avoid sleep inertia, and consider setting an alarm to help you stay on track.
