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How much do you know about sleep? Here are some interesting facts about sleep you might not have been aware of.
7 Min Read | By Chris Thomson
Last Modified 25 September 2024
Most of what we know about sleep has only been discovered in the last 25 years, but it’s fair to say we’ve made up for it. Scientists and researchers all over the globe are learning more and more about sleep every day, teaching us things we never even dreamed about (excuse the pun). We’ve put together a list of 25 of the most interesting and surprising facts about sleep that you may not know.
Before colour television was introduced, only 15% of people dreamt in colour. Older people dream in black and white more often than younger people, it’s all here in this study.
This will come as no surprise to most cat owners. Every sofa is a sofa bed to them. Otherwise, they can be found on your favourite seat or keyboard.
Learn more about other animals and their sleep here, including ferrets, cheetahs, and sloths.
This obviously differs depending on the age of the human, but on average it’s around 33%, which is quite a lot when you think about it.
Related: How Do Sleeping Patterns Affect Your Sport?
This depends on how much you weigh, but sleeping does burn calories. This is because it’s part of your basal metabolic rate to do basic functions such as breathing, digestion and keeping your heart beating while asleep. The average person burns 50 calories an hour, making up an average of 400 calories for 8 hours of sleep.
This was set by a Californian student named Randy Gardner in 1964. This is definitely not recommended, however, as Randy experienced extreme sleep deprivation and others have died staying awake for too long.
The standard 8-hour sleep cycle is called the Monophasic cycle, and 4 other polyphasic cycles include multiple sleep phases each day. Biphasic splits with sleeping at night and taking a nap during the day. Everyman cycle consists of a 3.5-hour sleep at night and three 20-minute naps during the day. Dymaxion is where you take four 30-minute naps during the day, and finally, Uberman consists of six-eight 20 naps a day.
You can find out more with our guide to the different types of sleep cycles. To find out your ideal routine, check out our Sleep Calculator and discover the best time to go to sleep.
There are many instances where people have reported their deaf partners or children using sign language in their sleep.
We’ve all no doubt found it tricky getting out of bed before, but those suffering from Dysania find it particularly difficult. It’s most likely to be a form of Chronic Fatigue Syndrome.
Read More: Dysania Explained
Some people have even committed crime due to parasomnia, including sleep driving and even murder.
No one is totally sure why hypnic jerks occur but they are deemed to be perfectly healthy. However, they may be increased by anxiety, caffeine or physical activity close to bedtime. They’re more frequent in young people and decrease as we get older.
Read more: Why Do We Twitch And Jerk In Our Sleep?
This is according to the National Sleep Foundation. It’s also a myth that you shouldn’t wake someone who is sleepwalking.
Related: The Ultimate Guide to Sleeping Positions for Couples [Infographic]
Dr Sarah Brewer told us why this might actually be a good thing.
Neither are good for you, obviously, but this article claims that sleep is actually more important than food in the short term.
This is a topic that is really quite interesting and the timing of the blindness in a person’s life may impact what that person dreams about. There’s plenty more on this here.
After an additional 5 minutes, 90% of recollection is gone. Sigmund Freud believed this was because dreams represent our repressed thoughts and so our brain wants to get rid of them quickly. However, it’s much more likely due to our brains simply being used much more as soon as we’re awake and so we forget much of what we’ve dreamed about.
This study suggests that cutting a person’s sleep in half dramatically reduces pain threshold, although it’s not 100% clear why.
This is from research done by Professor Chris Idzikowski, director of the Sleep Assessment and Advisory Service, though five other sleeping positions have been identified: the log, yearner, starfish, soldier, and freefaller.
This is also according to Professor Idzikowski, suggesting that those who sleep in the foetal position “may appear tough but are actually sensitive souls right to their core.” See what the Professor says about the other sleep positions.
If it takes you less than five minutes, chances are, you’re sleep deprived.
How nice it must be to just go to sleep whenever and wherever you are!
Hands should apparently be positioned above the pillow so you’re in a ‘freefall’ position, whilst laying on your left side can apparently help reduce heartburn.
Related: Does Eating Cheese Before Bedtime Really Give You Nightmares?
Eating sugary foods might make you experience weird dreams, or nightmares. Where greasy food will likely make it harder to sleep as your body digests. What you put in your body can affect the quality of sleep or the dreams you have. There are also plenty of drinks to help you sleep.
Related: Sleep Foods – How Can Your Diet Help You Sleep
This comes from a study by academics at Bristol University – it can also help people relax and be more optimistic, even if you’re on a small income.
Instead, researchers have found that it’s most often feelings of sadness, guilt and confusion.
Photo Credit: Sarah Ross photography via Compfight cc
Want to know the meaning behind your dreams? Dream Encyclopaedia
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