Metaphors for Tired: Running on Empty, Fried, Burnt Out

On this page15 sections

1. Quick picker
2. Fuel and energy metaphors
3. Machine and computer metaphors
4. Death and zombie metaphors
5. Weight and body metaphors
6. Hitting a wall and crashing
7. Describing someone else as tired
8. Metaphors for sleepy (not just worn out)
9. Metaphors for getting your energy back
10. Which ones are fine at work?
11. Metaphors for tired in creative writing
12. Metaphor, simile or idiom?
13. Common mistakes
14. Practice
15. Quick answers

The best-known metaphors for tired are running on empty, running on fumes, my batteries are flat, I’m running out of steam, I’m fried, I’m a zombie today and I hit a wall. Each one says you are tired by saying you are something else: a car out of fuel, a dead battery, a burnt-out machine. That direct “is” is what makes them metaphors rather than similes.

Below they are grouped by the picture they use, with the kind of tiredness each one fits best: sleepy, physically worn out, mentally drained or burnt out over weeks. Some well-worn phrases such as “as tired as a dog” are actually similes; they are listed separately on similes for tired, and fixed expressions like “dead on your feet” are on idioms for tired.

Quick picker

Fuel and energy metaphors

The largest family treats your energy as fuel or charge. They are everyday English, safe in conversation and fine in most work chat.

• Running on empty. The tank shows empty but you keep going. “I’ve been running on empty since the baby arrived.”
• Running on fumes. Even less than empty: only the vapour is left. “By Friday the whole team was running on fumes.”
• Running out of steam. From steam engines losing pressure; energy or enthusiasm fading slowly. “We ran out of steam halfway through the clean-up.”
• My batteries are flat (UK) / dead (US). “Sorry, no party tonight. My batteries are completely flat.”
• I need to recharge. The positive side of the same image: rest restores the charge.
• My social battery is dead. A newer, very common way to say you are tired of socialising, not sleepy.
• Running on caffeine. The only fuel left is coffee. “I’m running on caffeine and spite today.”

Machine and computer metaphors

These describe a mind that is tired more than a body: slow thinking, mistakes, forgetting things.

• My brain is fried. Overheated circuits. After an exam or a long day of screens. “Ask me tomorrow; my brain is fried.”
• I’m burnt out (UK also burned out). A machine, or a candle, that has burned until nothing is left. Used for exhaustion that builds up over weeks or months of overwork, not after one late night.
• I’m on autopilot. You are doing things without thinking. “I drove home on autopilot.”
• My brain is buffering. Like a video that keeps loading. Casual and a bit playful.
• I need a reboot / I’m in low-power mode. Tech metaphors; light and informal.
• I’m running at half speed. You are working, but slowly.

Death and zombie metaphors

Exaggeration is the point here. They are informal and very common, but think twice before using them around someone who is grieving or ill.

• I’m dead. or I’m dead on my feet. Completely exhausted, usually after physical work.
• I’m a zombie. Up and moving, but not really alive. Perfect for the morning after a bad night.
• I’m a walking corpse. A stronger, more dramatic version.
• I’m brain-dead. Mentally exhausted. Use it about yourself; said about someone else, it is an insult.
• I’m done. or I’m finished. Nothing left to give for today.

Weight and body metaphors

These turn tiredness into physical weight, which is how it often feels after hard exercise or no sleep.

• My legs are lead. Heavy and hard to move. Runners use it a lot.
• My eyelids are made of lead / sandbags. You can hardly keep your eyes open.
• I’m a puddle. Too tired to hold yourself up. Playful.
• I’m wiped out. Everything has been wiped away. Common in American English.
• I’m drained. Your energy has been emptied out like water from a tank. Fits emotional tiredness as well as physical.
• I’m spent. Like money that has all been used up.

Hitting a wall and crashing

• I hit a wall. From long-distance running: the point where energy suddenly gives out. “I was fine until three, then I hit a wall.”
• I crashed. Fell asleep fast, or lost all energy suddenly after a burst of activity. “I crashed as soon as I got home.” “The sugar crash hit at 11.”
• I’m toast. Finished, done for. Casual, especially in American English.

Describing someone else as tired

Most of these metaphors also work about other people, usually with look or seem, and they often sound kinder than a plain comment on someone’s appearance:

• “You look wiped out. Go home.” (concern, not criticism)
• “The nurses on the night shift were running on fumes.”
• “By the last lap he had clearly hit a wall.”
• “The kids crashed the moment they got in the car.”
• “She’s been running on empty for weeks; someone should check on her.”

Two exceptions: brain-dead and zombie said about another person can sound like insults, so keep them for yourself. And “You look exhausted” is safer than any joke when you do not know the person well.

Metaphors for sleepy (not just worn out)

Being sleepy is not the same as being exhausted: you can be sleepy after a big lunch with plenty of energy left. These metaphors are about the pull of sleep itself.

• I’m fading. Your attention is slowly going, like a light dimming. “Keep talking, I’m fading.”
• The sandman is coming. From the folk figure who sprinkles sand in children’s eyes. Gentle and a little old-fashioned; good with children.
• I’m nodding off. Your head drops forward as you fall asleep. Literal at first, but used loosely for “nearly asleep”.
• My bed is calling me. Personification: the bed “calls” you home. Light and humorous.
• I’m in a fog. Thinking is slow and blurred, often after poor sleep or jet lag. “I’ve been in a fog all day after that flight.”
• I’m out like a light. Strictly a simile, but so fixed it works as an idiom; it describes falling asleep instantly.

For more on the sleep side of this topic, see similes for sleep.

Metaphors for getting your energy back

Many tiredness metaphors have a natural opposite, which is useful when you write about rest or recovery:

A second wind comes from running: the fresh energy that sometimes returns after you thought you were finished. “I was ready to quit at mile 20, then I got a second wind.”

Which ones are fine at work?

Most tiredness metaphors are casual. In a meeting or a message to a colleague, the milder ones are safe; the dramatic ones depend on your workplace.

• Safe almost anywhere: running out of steam, running on empty, I need to recharge, I hit a wall, drained.
• Fine with colleagues you know: my brain is fried, I’m on autopilot, I’m wiped out, I’m toast.
• Casual only: I’m dead, I’m a zombie, I’m a walking corpse, running on caffeine and spite.
• Handle with care: burnt out. Many people now use it for a real health problem, so saying “I’m burnt out” at work can be read as a serious statement, not a figure of speech.

In a formal email, plain words usually work better than any metaphor: “I’m unable to take this on this week” rather than “my batteries are flat”.

Metaphors for tired in creative writing

The phrases above are so familiar that readers hardly notice them as images. In a story or poem, a fresher picture tied to your scene works better. A few that build on the same ideas:

• “The day had wrung her out and hung her up to dry.”
• “His thoughts were moths knocking against a dark window.”
• “By midnight the house was a ship with everyone asleep below deck except her.”
• “Sleep was a tide, and every time she sat down it came in further.”

Keep one metaphor per moment. “Running on fumes, he hit a wall and his batteries died” mixes three machines and none of them lands.

Metaphor, simile or idiom?

A metaphor says tiredness is something: “I’m a zombie.” A simile compares with like or as: “I feel like a zombie”, “as tired as a dog”. An idiom is a fixed phrase whose meaning cannot be worked out from its words, and many idioms are old metaphors: “dog-tired”, “burning the candle at both ends”. The lines blur in everyday speech, but in a school exercise, like or as means simile. More on the difference: figurative language.

Common mistakes

Practice

A. Metaphor or simile?

1. I’m running on fumes.
2. I feel like a zombie.
3. My legs are lead.
4. I’m as tired as a dog.
5. My social battery is dead.

Answers: 1 metaphor; 2 simile (like); 3 metaphor; 4 simile (as … as); 5 metaphor.

B. Choose the best metaphor.

1. After three months of 60-hour weeks, she felt ____. (a) burnt out (b) like toast (c) on autopilot
2. He was fine all morning, then after lunch he ____. (a) ran on caffeine (b) hit a wall (c) recharged
3. “Can you check this report?” “Not now, my brain is ____.” (a) lead (b) fried (c) spent
4. She loved the party but went home early because her ____ was dead. (a) social battery (b) engine (c) zombie

Answers: 1 (a); 2 (b); 3 (b); 4 (a).

C. Replace the plain sentence with a metaphor from this page.

1. I have almost no energy left, but I still have two hours of work.
2. I can’t think clearly after six hours of exams.
3. I suddenly felt exhausted in the middle of the race.
4. After a week’s holiday, I have my energy back.

Possible answers: 1 I’m running on fumes, but I still have two hours of work. 2 My brain is fried after six hours of exams. 3 I hit a wall in the middle of the race. 4 After a week’s holiday, I’ve recharged my batteries.

Quick answers

What is a metaphor for tired? “I’m running on empty” is the most common; others are “I’m running on fumes”, “my batteries are flat”, “I’m a zombie” and “my brain is fried”.

What is a metaphor for being mentally tired? My brain is fried; my brain is buffering; I’m running on autopilot; I’m brain-dead (about yourself only).

What is a metaphor for burnout? “Burnt out” is itself one: a candle or engine that has burned until nothing is left. “Running on empty for months” says the same.

Is “running on empty” a metaphor or an idiom? Both: it began as a metaphor from cars and is now a fixed idiom.

Related: metaphors for sleep and metaphors for stress.