On this page13 sections
- Quick picker: which sleep idiom fits?
- Idioms for going to bed
- Idioms for falling asleep
- Idioms for sleeping deeply
- Idioms for a short sleep or nap
- Idioms for not sleeping
- Idioms for waking up and mornings
- Idioms for being tired and needing sleep
- Sleep idioms that are not really about sleep
- Phrases that are not sleep idioms
- Using sleep idioms in writing
- Practice: choose the right idiom
- Quick answers
The most common idioms for sleep are hit the hay and hit the sack (go to bed), nod off and drift off (fall asleep), sleep like a log and dead to the world (sleep deeply), catch forty winks or catch some Z’s (take a short nap), and toss and turn or not sleep a wink (sleep badly). Below they are grouped by the moment they describe, from heading to bed to dragging yourself up in the morning, each with its meaning, a natural example and a note on tone.
All of these are informal. They belong in conversation, messages, fiction and dialogue, not in a medical note or a sleep study. If you want the background on what makes a phrase an idiom rather than a simile or metaphor, the figurative language guide covers that; this page sticks to sleep.
Quick picker: which sleep idiom fits?
| You want to say… | Use |
|---|---|
| I’m going to bed now | hit the hay, hit the sack, turn in, call it a night |
| I fell asleep without meaning to | nod off, doze off, drop off |
| I fell asleep instantly | go out like a light, crash, conk out |
| I slept really well | sleep like a log, sleep like a baby, sleep like a top (British) |
| Nothing could wake him | dead to the world, out cold, out for the count |
| I’ll take a short nap | catch forty winks, catch some Z’s, grab some shut-eye, power nap |
| I couldn’t sleep | toss and turn, not sleep a wink, lie awake, stare at the ceiling |
| I stayed up on purpose | burn the midnight oil, pull an all-nighter |
| Don’t worry about it | don’t lose sleep over it |
| I’ll decide tomorrow | sleep on it |
| Time to get up | rise and shine |
| She’s grumpy this morning | she got up on the wrong side of the bed |
Idioms for going to bed
These describe the decision to stop for the day, not the moment you fall asleep. You can hit the sack and still lie awake for an hour.
| Idiom | Meaning | Example |
|---|---|---|
| hit the hay | go to bed | We’ve got an early flight, so I’m going to hit the hay. |
| hit the sack | go to bed | After the double shift, all I wanted was to hit the sack. |
| turn in | go to bed (a little more polite, fine with guests or older relatives) | Thanks for dinner. I think I’ll turn in early tonight. |
| call it a night | stop what you are doing and go home or to bed | It’s past midnight. Let’s call it a night and finish the puzzle tomorrow. |
| head to bed / head off to bed | go to bed (plain, neutral) | The kids headed off to bed without arguing, for once. |
| be off to dreamland / off to the land of Nod | going to sleep; playful, often said to or about children | Bath, story, and then you’re off to the land of Nod. |
Hit the hay and hit the sack are usually explained by old mattresses stuffed with hay or straw, and sacks filled with it; that reading fits the words, and both phrases are recorded in American English from the early 1900s. They are interchangeable. Turn in is the one to pick when you are a guest in someone’s house and want to sound polite rather than slangy.
Idioms for falling asleep
This group is about the moment sleep arrives, and the main difference between them is whether you meant to.
| Idiom | Meaning | Example |
|---|---|---|
| nod off | fall asleep, usually without meaning to, often sitting up | Grandpa nodded off halfway through the film. |
| doze off | slip into a light sleep | I dozed off on the train and missed my stop. |
| drop off | fall asleep (common in British English) | The baby finally dropped off around ten. |
| drift off | fall asleep gradually and gently | She drifted off to the sound of rain on the roof. |
| go out like a light | fall asleep very quickly and deeply | He was out like a light the second his head hit the pillow. |
| crash / crash out | fall asleep suddenly from exhaustion, often not in your own bed | After the wedding we crashed on my cousin’s sofa. |
| conk out | fall asleep abruptly (also used for machines that stop working) | I conked out at nine and slept for eleven hours. |
| flake out | collapse into sleep from tiredness (British, informal) | The kids flaked out in the back of the car. |
| can’t keep your eyes open | be so tired you are about to fall asleep | Sorry, I can’t keep my eyes open. Can we talk tomorrow? |
A note on nod off: it comes from the head dropping forward as you fall asleep sitting up, which is why it suits lectures, meetings and armchairs better than beds. Crash also has a second sense, “stay the night somewhere”: Can I crash at your place? In American English flake out more often means “fail to show up as promised”, so use it for sleep only with British readers.
Idioms for sleeping deeply
Several of these are similes, built with like. They are the most useful set for writers, because they tell the reader how the sleep felt.
| Idiom | Meaning | Example |
|---|---|---|
| sleep like a log | sleep soundly without moving or waking | The hotel bed was perfect. I slept like a log. |
| sleep like a baby | sleep peacefully and well | Once the deadline passed, I slept like a baby. |
| sleep like a top | sleep very soundly (British, a little old-fashioned) | Country air always makes me sleep like a top. |
| sleep like the dead | sleep so deeply that nothing wakes you | I slept like the dead after the hike. |
| dead to the world | fast asleep and unaware of anything | The fire alarm went off and he was still dead to the world. |
| out cold | deeply asleep (also: knocked unconscious) | Don’t bother calling her; she’s out cold. |
| out for the count | deeply asleep, from boxing’s ten-second count | Three nights of exams and he’s out for the count. |
| fast asleep / sound asleep | completely asleep (standard phrases, fine in any register) | By the time we got home, both children were fast asleep. |
| sleep the sleep of the just | sleep peacefully, with a clear conscience (literary, often ironic) | With the report finally sent, she slept the sleep of the just. |
| in the land of Nod | asleep (playful) | Quiet, please. The baby’s in the land of Nod. |
| in the arms of Morpheus | asleep or dreaming (literary or mock-grand) | By midnight the whole house was in the arms of Morpheus. |
| saw logs / saw wood | snore loudly (American) | My roommate was sawing logs all night. |
| a heavy sleeper | someone who sleeps deeply and is hard to wake | He’s a heavy sleeper, so you’ll have to shake him. |
Some background where it is actually known. Morpheus is the god of dreams in Ovid’s Metamorphoses, so “in the arms of Morpheus” sounds deliberately grand. “The land of Nod” is a pun: in Genesis it is the land Cain was sent to, and writers such as Jonathan Swift turned it into a joke about nodding off. “Sleep like a top” refers to a spinning top, which looks perfectly still when it spins fastest. Nobody knows for certain why logs, but the picture is of something heavy that does not move.
Be careful with sleep like a baby: people who have looked after a newborn often use it ironically, because real babies wake every two hours. In a joke that is a feature; in a straight sentence it is fine.
Idioms for a short sleep or nap
| Idiom | Meaning | Example |
|---|---|---|
| catch forty winks | take a short nap | I’ll catch forty winks before the guests arrive. |
| catch some Z’s / get some Z’s | get some sleep (American, casual; from the “zzz” of comics) | You look wrecked. Go catch some Z’s. |
| grab some shut-eye | get some sleep, often a short amount | Try to grab some shut-eye on the flight. |
| power nap | a short nap meant to restore energy | A twenty-minute power nap gets me through the afternoon. |
| rest your eyes | a joking excuse for being caught asleep | “Were you asleep?” “No, I was just resting my eyes.” |
| a catnap | a short, light sleep, often in a chair | She had a quick catnap between meetings. |
Idioms for not sleeping
These split into two different situations, and the original version of this page mixed them up. Some describe being unable to sleep. Others describe choosing to stay awake.
When you can’t sleep
| Idiom | Meaning | Example |
|---|---|---|
| toss and turn | move around restlessly in bed | I tossed and turned all night before the interview. |
| not sleep a wink / not get a wink of sleep | not sleep at all | The neighbours’ party went on till four. I didn’t sleep a wink. |
| lie awake | stay in bed unable to fall asleep | I lay awake for hours, replaying the conversation. |
| stare at the ceiling | lie awake with nothing to do but think | I spent half the night staring at the ceiling. |
| count sheep | try a trick to fall asleep (now mostly said jokingly) | I’ve counted sheep, I’ve had warm milk, and I’m still awake. |
| a light sleeper | someone who wakes at the smallest sound | I’m a light sleeper, so earplugs are a must. |
| can’t switch off | unable to stop thinking and relax | After a late shift I just can’t switch off. |
| a restless night / a bad night | a night of broken sleep | The baby had a restless night, so we all did. |
When you stay up on purpose
| Idiom | Meaning | Example |
|---|---|---|
| burn the midnight oil | work or study late into the night (from working by oil lamp) | She’s been burning the midnight oil to finish her thesis. |
| pull an all-nighter | stay up the whole night, usually to work or study | We pulled an all-nighter to get the app ready for launch. |
| a night owl | someone who likes staying up late | I’m a night owl; I do my best writing after eleven. |
| stay up / sit up | not go to bed (sit up: wait up for someone) | Mum always sat up until we got home. |
Burn the midnight oil is not about insomnia. If you could not sleep because of worry, say you lay awake or tossed and turned; if you stayed up to finish work, you burned the midnight oil.
Idioms for waking up and mornings
| Idiom | Meaning | Example |
|---|---|---|
| rise and shine | a cheerful order to get up | Rise and shine! Breakfast is on the table. |
| get up on the wrong side of the bed (US: wake up on the wrong side of the bed) | be in a bad mood all day for no clear reason | Careful with the boss today; she got up on the wrong side of the bed. |
| at the crack of dawn | very early, as the sun comes up | We left at the crack of dawn to beat the traffic. |
| up with the lark | up very early (British) | My dad’s up with the lark, even on Sundays. |
| an early bird | someone who gets up early by choice | She’s an early bird; she runs before work. |
| bright-eyed and bushy-tailed | awake, alert and keen | How are you so bright-eyed and bushy-tailed at six a.m.? |
| sleep in | stay in bed later than usual on purpose | It’s Saturday. I’m sleeping in. |
| oversleep / sleep through the alarm | sleep later than you meant to | I slept through my alarm and missed the bus. |
In the old version of this page, “up with the lark” and “up at the crack of dawn” sat in the list of idioms for difficulty sleeping. They are not about poor sleep at all: they simply mean getting up early, often happily.
Idioms for being tired and needing sleep
| Idiom | Meaning | Example |
|---|---|---|
| dead on your feet | so tired you can barely stand | By the end of the move we were all dead on our feet. |
| dog-tired / bone-tired | extremely tired | I’m dog-tired; I’ll call you tomorrow. |
| running on fumes | still going with almost no energy left | I’ve had four hours of sleep this week. I’m running on fumes. |
| ready to drop | about to collapse with tiredness | After twelve hours on the ward, she was ready to drop. |
| catch up on sleep | sleep extra to make up for lost sleep | I spent the weekend catching up on sleep. |
For a longer list of tiredness phrases, see idioms for tired.
Sleep idioms that are not really about sleep
These use sleep as a picture for something else. Learners trip over them because the literal reading is so tempting.
| Idiom | What it really means | Example |
|---|---|---|
| sleep on it | wait until tomorrow before deciding | It’s a big offer. Sleep on it and call me in the morning. |
| lose sleep over something | worry about it (most often in the negative) | It’s one bad review. Don’t lose sleep over it. |
| let sleeping dogs lie | don’t stir up an old problem that has gone quiet | I wanted to ask about the old argument, but I decided to let sleeping dogs lie. |
| asleep at the wheel / asleep at the switch | not paying attention to a duty | The regulators were asleep at the wheel while the fraud grew. |
| could do it in my sleep | could do it very easily | I’ve made this recipe so often I could make it in my sleep. |
| a wake-up call | a warning that makes you face a problem | Failing the mock exam was a wake-up call. |
| put to sleep | (of a pet) end its life painlessly; (of a patient) anaesthetise; also, to bore | The vet said it was kinder to put the old dog to sleep. |
| sleep around | have casual sexual relationships with many people | (Avoid in innocent contexts; it is not about napping.) |
When not to use them: “put to sleep” said of a pet means it died, so do not use it for settling a child at bedtime (“I put the baby down” or “got the baby off to sleep” is what parents say). “Sleep around” and “sleep with someone” are about sex, not rest, so a sentence like “I slept with my colleague on the train” will be misread; say “I fell asleep next to my colleague”.
Phrases that are not sleep idioms
Lists of sleep idioms online often pad themselves with ordinary phrases or mistakes. A few to watch for:
- “Out like a lightbulb” is not an idiom. The phrase is out like a light.
- “Lose consciousness” means fainting or being knocked out, not falling asleep. Saying someone lost consciousness after a long day sounds like a medical emergency.
- “Zone out” means to stop paying attention while awake, not to fall asleep.
- “In a state of suspended animation” and “in a dormant state” are technical phrases (science fiction, biology), not everyday ways to say someone is asleep. “Hibernating” works only as a joke about someone who barely leaves bed.
- “Engrossed in sleep” is not natural English. You are engrossed in a book; you are fast asleep.
- “Slumber”, “snooze” and “doze” are single verbs, not idioms. They are still useful words, just not figurative ones.
Using sleep idioms in writing
- Pick one and commit. “He hit the sack, nodded off and slept like a log” stacks three clichés into one sentence. One well-placed idiom does more.
- Match the speaker. A teenager says “I crashed”; a grandmother says “I’ll turn in”. “In the arms of Morpheus” sounds bookish or mock-heroic, which is useful for comic narrators.
- Use the idiom that matches the cause. Worry: tossed and turned, lay awake. Work: burned the midnight oil, pulled an all-nighter. Noise: didn’t sleep a wink.
- Formal writing: in an essay or report, use plain words such as “slept poorly”, “fell asleep” or “was sleep-deprived”. The idioms read as chatty there.
If you want images rather than set phrases (night as a blanket, sleep as a tide), the metaphors for sleep page collects those, and funny ways to say you’re going to sleep has lighter goodnight lines. For the dreaming side of the night, see idioms for dreams.
Practice: choose the right idiom
- I’ve got an interview at eight, so I’m going to ______ early. (hit the hay / sleep on it)
- The talk was so dull that half the audience ______. (nodded off / burned the midnight oil)
- Don’t give me an answer now. ______ and tell me tomorrow. (Sleep on it / Sleep like a log)
- The thunder was loud, but the kids were ______ and didn’t hear a thing. (dead to the world / up with the lark)
- I was so worried about the results that I ______ all night. (tossed and turned / caught forty winks)
- We ______ to finish the group project before the deadline. (pulled an all-nighter / let sleeping dogs lie)
- It’s only a parking ticket. Don’t ______ over it. (lose sleep / sleep in)
- Why is Dad so grumpy? He must have got up on the ______ side of the bed. (wrong / bright)
- I’ll ______ before dinner; wake me at six. (catch forty winks / go out like a light)
- She’s made that commute so often she could do it ______. (in her sleep / in the land of Nod)
Answers
- hit the hay
- nodded off
- Sleep on it
- dead to the world
- tossed and turned
- pulled an all-nighter
- lose sleep
- wrong
- catch forty winks
- in her sleep
Quick answers
What is an idiom for going to sleep?
“Hit the hay” and “hit the sack” are the most common, with “turn in” as a slightly more polite option. For the moment you actually fall asleep, use “nod off”, “drift off” or “go out like a light”.
What is a funny way to say someone is going to sleep?
“He’s off to the land of Nod”, “she’s catching some Z’s” or, when you find them asleep in a chair, “he’s just resting his eyes”.
Is there an idiom for when you just woke up and still want to sleep?
Not one fixed idiom, but people say they “can’t keep their eyes open”, are “half asleep” or “not awake yet”. If the grogginess makes them grumpy, they “got up on the wrong side of the bed”.
What does “sleep on it” mean?
It means postponing a decision until the next day so you can think it over. It has nothing to do with lying on top of something.
Is “sleep like a baby” positive?
Usually yes: it means you slept peacefully. Parents sometimes use it ironically, since babies wake often, so context decides.
What is the difference between “sleep in” and “oversleep”?
You sleep in on purpose, as a treat. You oversleep by accident, and usually you are late because of it.