All
6 Bizarre Sleep Habits and the Facts Behind Them
Last updated: September 2026 Human sleep looks odd enough from the outside, but nature and history make it look positively sensible. Dolphins sleep with half a brain at a time, horses doze standing up, and our own ancestors treated the night as two sleeps with an intermission. Here are six of the strangest sleep habits on record, and what the facts behind them say about your own nights. Quick answer: The animal kingdom's strangest sleep habits are real adaptations: dolphins sleep one brain hemisphere at a time so they can keep surfacing to breathe, and horses lock their legs to doze upright while predators prowl. The strangest human habits are mostly history or bad ideas: segmented "first and second sleep" was normal before artificial light, while extreme polyphasic schedules like the Uberman are unsustainable for almost everyone. The common thread is that every species protects deep sleep however it can, and humans do it best in one consolidated night. 1. Dolphin sleep: the art of unihemispheric slumber Dolphins sleep with one half of the brain at a time, keeping the other awake with one eye open so they can keep breathing at the surface and watching for danger. It is called unihemispheric slow-wave sleep, and it means a dolphin is never fully unconscious. Humans have no true equivalent, though the "first night effect", sleeping badly in a new place while part of the brain stays vigilant, is a faint echo of the same instinct. 2. Sleeping upright like horses Horses can doze standing thanks to a stay apparatus, tendons and ligaments that lock the legs without muscular effort, an anti-predator adaptation that lets them bolt from a standing start. Even so, they must lie down for their REM sleep. For humans there is no benefit to upright sleeping, whatever the occasional claim; we get our best sleep, and all of our deep and REM stages, lying down. 3. Segmented sleep: a sleep pattern from the past Before artificial light, many Europeans slept in two shifts: a "first sleep" from early evening, an hour or two awake around midnight for prayer, chores or conversation, then a "second sleep" until dawn. The historian A. Roger Ekirch documented hundreds of references to it. Waking in the small hours is, in that sense, an old human pattern rather than a malfunction, though the modern schedule rewards a consolidated night; if your midnight intermissions are unwanted, our guide on resetting your body clock covers how to close the gap. 4. Sleeping with animals (literally!) Surveys consistently find that most UK pet owners let their animals share the bed. The trade-off is real in both directions: a pet's movement, noise and heat fragment sleep, and pets also add allergens and dander to the very surface you breathe against for eight hours, which our guide to dust mites in your bed puts in context. Against that, many people genuinely sleep more securely with a companion. If the dog stays, wash the bedding more often and give the pet its own blanket zone. 5. Extreme polyphasic sleep: the Uberman schedule The Uberman schedule swaps a night's sleep for six 20 to 30 minute naps spread around the clock, about two to three hours of sleep a day, with da Vinci and Tesla rumoured, on thin evidence, to have lived this way. Sleep scientists are close to unanimous that it does not work: deep sleep and REM need longer consolidated blocks, and chronic restriction of both collects the debts covered in our sleep debt guide. Strategic napping helps; replacing the night does not. 6. Fear-induced "segmented sleep" in Korowai tribes The Korowai people of Indonesian Papua traditionally build treehouses high above the forest floor, and accounts describe light, frequently broken sleep, a pattern shaped by an environment that rewards vigilance. It is a reminder that how safely we sleep has always shaped how deeply we sleep, and that the modern luxury is a bedroom secure enough to switch off in completely. What do the bizarre habits teach the rest of us? One consistent lesson: every species protects its deep sleep with whatever its environment allows, and for humans that means a consolidated night somewhere dark, quiet, cool and comfortable. However ordinary it sounds next to dolphin brains and treehouses, the bed is the human adaptation, and every model in our range of hybrid mattresses is built for exactly that job: tall pocket springs that keep a partner's movement on their side, and open-cell memory foam that stays cool through the night. REM-Fit 3000 Supreme Hybrid Mattress 3000 tall premium pocket springs under open-cell memory foam: the unremarkable habit that outperforms every bizarre one. Shop the 3000 Supreme ✓ 100-night trial (200 with a protector)✓ 15-year guarantee✓ Free UK delivery✓ 0% finance Bizarre sleep habits FAQs Last updated: September 2026 Do dolphins really sleep with one eye open? Yes. Dolphins sleep one brain hemisphere at a time, keeping the opposite eye open, so they can continue surfacing to breathe and stay alert to threats. It is called unihemispheric slow-wave sleep, and it means a dolphin is never fully asleep the way humans are. Is segmented sleep healthy for humans? It was normal before artificial light, so waking in the small hours is not automatically a disorder. But the modern day rewards one consolidated night, and for most people a fixed wake time and a good sleep environment close the midnight gap better than embracing the intermission. Does polyphasic sleep work? Not the extreme versions. Schedules like the Uberman cut total sleep to two or three hours a day, starving the deep sleep and REM that only come in longer blocks, and almost nobody sustains them. A single short afternoon nap is the version of polyphasic sleep that science supports. Should I let my pet sleep in my bed? It is a trade: pets fragment sleep with movement, noise and heat, and add allergens to your bedding, but many owners feel calmer and sleep better with them there. If the pet stays, wash bedding frequently, use a mattress protector, and give them their own blanket at the foot of the bed. Sources: Sleep Foundation, Biphasic Sleep; A. Roger Ekirch, At Day's Close: Night in Times Past; Sleep Foundation, Animals and Sleep.
Read more
Why Consistency is Key to Better Sleep
Establishing a regular sleep pattern can be one of the most transformative changes you make for your health, productivity and overall happiness. Let’s dive into why consistency in your sleep schedule is the secret to better rest and a better you. 1. A Stronger Internal Clock Your body runs on a finely tuned internal clock called the circadian rhythm. This natural 24-hour cycle regulates essential functions like digestion, hormone production, and, most importantly, sleep. A consistent bedtime and wake-up time help synchronise your circadian rhythm, making it easier to fall asleep, stay asleep and wake up refreshed. Irregular schedules disrupt this rhythm, leaving you groggy and out of sync. 2. Improved Sleep Quality When you stick to a regular sleep schedule, your body learns to anticipate rest. This anticipation encourages deeper, more restorative sleep cycles, including the crucial REM (rapid eye movement) and deep sleep stages. These stages are vital for memory consolidation, emotional regulation, and physical recovery. Irregular sleep, on the other hand, can fragment these cycles, reducing the quality of your rest. 3. Enhanced Mental Clarity and Focus Ever felt foggy-headed after a poor night’s sleep? Regular sleep patterns can sharpen your mental acuity. Consistency ensures your brain gets the restorative sleep it needs, helping you tackle the day with greater focus, creativity and problem-solving abilities. 4. Boosted Mood and Emotional Well-Being Sleep and mental health are deeply intertwined. Erratic sleep patterns can disrupt the delicate balance of neurotransmitters in your brain, contributing to feelings of irritability, anxiety, or even depression. Sticking to a consistent schedule promotes emotional stability and enhances your ability to cope with stress. 5. Better Physical Health Your body uses sleep to repair and rejuvenate. Regular sleep supports a stronger immune system, reduces inflammation and promotes heart health. Studies have shown that those with irregular sleep patterns are at higher risk for chronic conditions like diabetes, hypertension and obesity. Consistency in your rest helps your body function at its best. 6. Energy That Lasts All Day When you sleep irregularly, you might feel like you’re constantly chasing energy—relying on caffeine or sugar to push through the day. A regular sleep pattern, however, ensures that your energy levels are naturally steady and sustainable, reducing the need for artificial boosts. Tips for Establishing a Regular Sleep Pattern Set a Fixed Bedtime and Wake Time: Choose times that allow for 7-9 hours of sleep and stick to them, even on weekends. Create a Relaxing Bedtime Routine: Wind down with calming activities like reading, meditation, or gentle stretching. Limit Screen Time Before Bed: Blue light from screens can interfere with your body’s production of melatonin, the sleep hormone. Optimise Your Sleep Environment: Invest in a comfortable, supportive mattress and bedding, keep your room cool, and block out noise and light. Be Patient: It may take a few weeks to fully adjust, but consistency will pay off in improved sleep and well-being. Conclusion A regular sleep pattern is more than just a habit—it’s an investment in your health, happiness and productivity. By prioritising consistency in your sleep schedule, you’re setting the stage for better rest and reaping benefits that extend far beyond the bedroom. So tonight, resist the temptation of “just one more episode” or a late-night scroll. Your body—and mind—will thank you tomorrow.To learn more about how REM-Fit can help you achieve better sleep, please email our knowledgeable team at sales@rem-fit.co.uk.
Read more
Signs It's Time for a New Bed Frame: A Comprehensive Guide
A bed frame is more than just a piece of furniture; it's the foundation of your sleep sanctuary. Over time, however, even the sturdiest bed frames can start to show signs of wear and tear. Knowing when it's time to replace your bed frame is crucial for maintaining comfort, support, and overall sleep quality. In this guide, we'll explore the key indicators that suggest it might be time for a new bed frame. 1. Visible Damage The most obvious sign that you need a new bed frame is visible damage. This could include cracks, splintered wood, bent metal, or significant structural issues. If you notice any of these issues, it's a clear indication that your bed frame is no longer providing the support and stability you need for a good night's sleep. 2. Squeaking or Creaking Sounds Do you find yourself woken up by squeaking or creaking sounds every time you move in bed? This could be a sign that your bed frame is worn out or improperly assembled. While some occasional noise is normal, persistent squeaking or creaking is a strong indicator that it's time to invest in a new bed frame. 3. Sagging or Uneven Support A sagging or uneven mattress is often blamed for poor sleep quality, but the culprit could actually be your bed frame. Over time, wooden slats may warp or metal frames may bend, leading to inadequate support for your mattress. If you notice any sagging or unevenness when lying on your bed, it's time to inspect your bed frame for signs of wear. 4. Difficulty Assembling or Disassembling If you struggle to assemble or disassemble your bed frame due to warped or damaged components, it's a clear sign that it's time for a replacement. Difficulty in assembly not only indicates structural issues but can also make it challenging to move or transport your bed frame when needed. 5. Allergies or Irritations Old bed frames can harbour dust mites, allergens, and even mold, especially if they've been exposed to moisture or spills. If you notice an increase in allergy symptoms or unexplained skin irritations, it could be a sign that your bed frame is due for an upgrade. 6. Style and Aesthetic Preferences While functionality and comfort are paramount, don't overlook the importance of style and aesthetics when considering a new bed frame. If your current frame no longer matches your décor or personal taste, it might be time to explore newer options that better suit your style preferences. 7. Changes in Lifestyle or Needs As your lifestyle changes, so too may your sleep needs. If you've recently undergone a major life event such as marriage, moving to a new home, or experiencing a change in health status, it's worth reassessing whether your current bed frame is still meeting your needs. Conclusion Your bed frame plays a crucial role in the quality of your sleep and overall well-being. By being aware of the signs that indicate it's time for a replacement, you can ensure that you continue to enjoy restful nights and wake up feeling refreshed. Whether it's visible damage, creaking sounds, sagging support, or changes in lifestyle, don't hesitate to invest in a new bed frame when necessary. Your body will thank you for it with nights of comfortable, rejuvenating sleep.If you would like to find out how REM-Fit can help you to get a better night’s sleep, get in touch with our experienced and knowledgeable staff via live chat or email us via sales@rem-fit.co.uk
Read more
The Changing Nature of Sleep: How Our Rest Evolves as We Age
In this blog, we will delve into the intriguing changes that occur in our sleep as we age, shedding light on the intricate relationship between age and the quality of our rest.
Read more
