Everybody loves a good sleep

Why do we “sleep tight”? 12 sleep-related idioms explained


Published on March 24, 2026


Image: Alexander Possingham

Have you ever uttered the words "sleep tight" or "hit the hay" before going to bed? These phrases have existed for ages, but their meanings and origins are not always apparent. Some are directly related to sleeping, while others are metaphors for entirely different things. Take a look at 12 of these idioms. Do you use any of them?

1

Sleep tight

Image: Sinitta Leunen

"Sleep tight" is a phrase most people know from the bedtime verse: "Sleep tight, don’t let the bedbugs bite". It’s often claimed to come from the old practice of tightly tying ropes on bed frames to keep mattresses firm and comfortable. This helped prevent sagging and made for a better night’s sleep.

In older English, "tight" simply meant "soundly" or "well", making "sleep tight" a wish for a good night’s sleep.

2

Hit the hay

Image: Simon Infanger

"Hit the hay" dates back to the late 19th or early 20th century and is often linked to the practice of stuffing hay into sacks or mattresses for sleeping, which is also commonly cited as an explanation for the phrase "hit the sack."

Another theory suggests that farm workers sometimes slept directly in haystacks, making "hay" a stand-in for "bed." Because "hit the hay" appears in print slightly earlier than "hit the sack," some believe it may have come first.

3

To sleep like a baby

Image: hessam nabavi

Anyone who has had a newborn knows how strange the phrase "sleep like a baby" sounds: babies wake up often and cry! Yet, the idiom means to sleep peacefully and deeply.

The idea is that when babies do sleep, they’re completely at ease, with no worries to disturb them. That peaceful, undisturbed state is what the phrase refers to, even if it doesn’t match the full reality.

4

Let sleeping dogs lie

Image: Irina

"Let sleeping dogs lie" might sound odd at first, but its meaning becomes clear with a bit of explanation. It’s a warning to leave past issues alone, especially sensitive ones.

The phrase compares old disputes to sleeping dogs: if you wake them, they might react aggressively. Similarly, revisiting old problems can stir up trouble best left alone.

5

A catnap

Image: Aleksandar Cvetanovic

A "catnap" is a short, light nap, usually under 30 minutes, during which you do not enter deep sleep. Studies suggest that even a 10-minute nap can be refreshing, sometimes nearly as effective as a longer one, though the ideal length varies by person.

The term comes from cats’ daytime sleep habits. Since wild cats had to stay alert for danger, they took quick, light naps. Today’s cats do the same, snoozing lightly throughout the day, just like a good catnap.

6

Wrong side of the bed

Image: Greg Pappas

"Waking up on the wrong side of the bed" means starting the day in a bad mood. The phrase comes from an old Roman superstition.

Romans, including Augustus Caesar, believed getting up on the left, or sinister, side brought bad luck. As a result, the "wrong side" was more than just a bad mood starter; it was thought to be a bad omen.

7

Sleep like a log

Image: Shane

To "sleep like a log" means to sleep deeply and without moving, like a heavy log lying still. It’s a common way to describe a peaceful, undisturbed night.

The origin of the phrase is unclear, but some link it to lumberjacks who slept soundly after hard work. Others connect it to the similarity between snoring and the sound of sawing.

8

Counting sheep

Image: Annie Spratt

"Counting sheep" means imagining sheep jumping over a fence, one by one, to help you fall asleep. It’s a classic mental trick to quiet the mind.

The phrase likely comes from shepherds who counted their flocks at night to ensure none were missing, a repetitive and calming routine before bed.

9

Lose sleep over something or somebody

Image: Михаил Калегин

The idiom "to lose sleep over something" means to worry about something to the point that it becomes difficult to sleep, or to be so concerned that it disrupts one’s rest.

While the exact origin of the phrase is difficult to pinpoint, it likely evolved from the idea that intense worry and stress can interfere with the body's natural sleep cycle.

10

Do something in your sleep

Image: Nubelson Fernandes

To "do something in your sleep" means to do something very easily and effortlessly, usually because you have done it so many times that it's become second nature. It's a metaphorical way of saying that you are so proficient at a task that you don't even have to think about it, as if you could do it while unconscious.

11

Sleep with one eye open

Image: Jamie Street

"Sleep with one eye open" means staying alert or cautious, especially in risky situations. It suggests being ready for trouble, even while resting.

The phrase is often linked to animals such as dolphins and certain birds that can literally sleep with part of their brain awake to remain safe.

12

Sleep around the clock

Image: Vin Jack

To "sleep around the clock" means to sleep for many hours without waking. It often happens when you're exhausted or feeling unwell. It’s a way in which the body tries to recover energy.


Don't swallow that!

Drink coffee every day? Here's something you need to know!


Published on March 24, 2026


Image: Thought Catalog

There are some common beliefs about food that, despite their popularity, are actually fake. While science has already done its job and debunked them, many of these myths have an explanation! If you want to know the story behind these myths and the truth revealed by nutritionists, don't miss this article!

1

"Coffee and tea dehydrate you"

Image: Jonas Jacobsson

There's a common misconception about coffee and tea that many people still believe. It has long been said that these delicious infusions cause dehydration. Luckily for all coffee lovers, this is a myth!

It turns out that the caffeine present in coffee and tea is indeed a diuretic, which causes you to go to the bathroom more often. However, you'd need to consume large amounts —far more than most people typically drink— to become dehydrated.

2

"White potatoes are bad"

Image: Franco Antonio Giovanella

We know that white potatoes are delicious, but why do many people leave them out of their diet? Well, because there has always been a misconception about this vegetable.

We should give the poor potato another chance and let it defend itself! This vegetable is actually a good source of nutrients like vitamin C, potassium, and fiber, especially if you eat the skin. What caused them to be accused of being "bad" is their higher glycemic index compared to other vegetables, which can lead to a fast rise in blood sugar levels. But if you don't have any health conditions related to sugar in your blood, potatoes can be part of a balanced diet. Just remember to leave the oil out of the recipe!

3

"Chocolate causes acne"

Image: Jessica Loaiza

Who can say no to a little piece of delicious chocolate? But this tasty treat hasn't escaped the fake news either.

For a long time, it has been accused of causing acne on the skin of those who eat it. However, there's no scientific evidence directly linking chocolate with the skin condition. The skin's reaction to certain ingredients varies from person to person, and acne is more often associated with products high in added sugar or dairy rather than chocolate itself.

4

"You need to detox regularly"

Image: Rajasekhar R

Although you may feel that your body is in urgent need of a detox after a heavy dinner, you don't really need special juices for that. In recent years, "detox" recipes and diets have gained a lot of traction, especially in social networks. However, the human body naturally "detoxifies" itself through your liver, kidneys, lungs, and digestive system as long as you mantain a healthy and balanced diet.

5

"Nothing after 7 p.m."

Image: Lukas Blazek

Nothing bad will happen if you eat something after 7 p.m. While it's true that heavy meals close to bedtime can make you feel a little sick or give you a stomach ache, the "nothing after 7" rule is actually a myth.

Fortunately, our stomachs can't tell time; what matters is eating healthy and trying to finish meals at least 2-3 hours before going to bed, regardless of your bedtime.

6

"Carrots improve your eyesight"

Image: Gabriel Gurrola

During WWII, it was said that British pilots had great eyesight and aim thanks to the large amount of carrots they included in their diet. However, over time, it was revealed that their advantage came more from the use of radar technology rather than from carrots.

Although this vegetable is indeed a good source of vitamin A —which is very beneficial for your eyes— eating carrots alone is not enough to keep your eyes healthy, let alone cure any eye condition.

7

"Breakfast is the most important meal of the day"

Image: Brooke Lark

Every meal of the day is important, but what you eat matters more than when you eat it.

The idea that breakfast is the most important meal of the day gained fame following cereal advertising campaigns in the early 20th century. However, science shows that it depends on each person's needs, with the quality of your food being more important than the time of day you eat it.

8

"You must wait 30 minutes before swimming"

Image: Haley Phelps

If you're like us and love summer, here's some good news for you: It has been shown that there is no evidence to point out that swimming after eating is harmful.

The wait to swim after lunch is over! While eating too much might make you feel a bit heavy, the truth is that a break in the pool won't harm your digestion.

9

"Eating healthy is too expensive"

Image: Anna Pelzer

Many people still believe that eating healthy is expensive, and that's why they don't give it a chance. But that's actually a myth associated with the high prices of some products labeled as "Low fat" or "Light in calories."

While it's true that the least healthy foods are often the quickest and cheapest, there are many healthy options that are also affordable. Whole grains (rice, oats), legumes (beans, lentils), and frozen, canned, or fresh vegetables are great options to start!

10

"To lose weight, avoid fruits"

Image: Jessica Lewis

Although delicious, sugar often gets a bad reputation, which is why fruits are sometimes viewed with suspicion by those trying to lose weight. However, the truth is that not all sugars are the same.

As products given to us by nature, fruits are rich in sugar, but the natural kind, which your body digests differently than artificial and refined added sugars. Plus, fruits are rich in nutrients such as vitamins, minerals, fiber, and antioxidants!

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herald

/ˈhɛrəld/