Everybody loves a good sleep

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

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?

Image: Sinitta Leunen

"Sleep tight" is often said 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.

Beds were often made with straw and rope, which loosened over time. Tightening the ropes regularly kept the bed sturdy and more comfortable.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Are these in your diet?

Go ahead, eat that pizza: These foods are pretty healthy after all!

No doubt, most of us have the food pyramid etched in our minds. For a long time, we have accepted the fact that tempting treats (like chocolate, pizza, or beer) must be mostly or entirely avoided. But… is that entirely true? As it turns out, there are caveats about some of these so-called guilty pleasures. Wouldn’t you like to learn which snacks are actually pretty healthy for you? Read on!

Popcorn is a whole grain, high in fiber, and packed with polyphenols (antioxidants). Air-popped popcorn with minimal salt or oil is healthier than many so-called "diet" snacks.

This is very good news for those with a sweet tooth! Dark chocolate (that means, products that have more than 70% cocoa) contains flavonoids that may improve blood flow and help reduce blood pressure. No need to cut it out entirely!

Coffee has long been maligned for "raising blood pressure," but it is now linked to lower risks of heart disease, Parkinson’s disease, and type 2 diabetes, again, thanks largely to its antioxidants. The danger, of course, lies in adding sugar, cream, syrups, and whatnot. Stick to a healthy brew!

Yes, excess sodium is harmful, but cutting it out completely can also be risky. Sodium helps maintain fluid balance and supports proper nerve and muscle function. Make sure you don’t entirely skip it!

Pizza with a caveat, that is. The healthiest pizza you can eat is homemade or thin-crust.

When made with whole-grain dough, real cheese, and veggie toppings, pizza can be a balanced meal, combining carbs, protein, and calcium. It’s the fast-food, oil-dripping, heavily-topped version that’s the real culprit.

"What’s beer doing on this list?" you might wonder. Surprise! Moderate beer consumption (especially darker varieties) can provide antioxidant benefits and contribute B vitamins. Again, moderate is the magic word, not "happy hour every day."

Remember when eggs were demonized for cholesterol? Modern studies show dietary cholesterol doesn’t raise blood cholesterol as much as once believed. Eggs are nutrient-dense, packed with choline and protein.

Sure, potatoes often rank low on lists of healthy foods when we’re thinking of chips or French fries.

But the tubers themselves are rich in potassium, vitamin C, and resistant starch, which support gut health. When prepared simply, such as by boiling, they can be a nutritious addition to a balanced diet.

Demonized during the low-fat craze, natural butter, when consumed in small amounts, is often considered less harmful than margarine once was, particularly when margarines were filled with trans fats. Butter contains fat-soluble vitamins and conjugated linoleic acid (CLA), which may have anti-inflammatory effects.

They’re often accused of being "too sugary." They might be, compared to other fruits, but they are also loaded with potassium, fiber, and tryptophan. This last one supports serotonin production and plays a role in mood balance.

It’s calorie-dense, but also rich in calcium, along with beneficial fats and protein. Some fermented varieties (like aged cheddar or gouda) even contain probiotics that may support gut health.

What’s the healthiest type of cheese? Well, cottage cheese is often cited in that role, thanks to its high protein content and relatively low calorie count.

Not all bread is created equal; sourdough’s fermentation process can lower its glycemic index and make some nutrients more bioavailable. Plus, it’s often easier to digest than regular white bread.

Often considered a "diet killer," but pure peanut butter (just peanuts and salt) is full of protein, healthy fats, and vitamin E. Its bad rap comes from sugary, hydrogenated versions. Avoid those, and you are good to go!