Have you ever stopped while writing a sentence and wondered whether it should be “nighttime” or “night time”? You are not alone. This small spelling question comes up surprisingly often, especially when switching between American and British English.
The good news is that the answer is fairly straightforward: “nighttime” is the standard one-word spelling in modern American English, while “night-time” is also found in British English. The open form “night time” is understandable, but it is generally not the preferred spelling when you mean the period of darkness.
In this guide, we will look at nighttime or night time grammar, dictionary usage, UK and US spelling, Canadian English, AP style, and examples so you can confidently choose the right form.
Nighttime or Night Time: The Quick Answer
If you need the short answer, use “nighttime” in most modern writing.
| Form | Usage | Recommendation |
| nighttime | Standard closed compound | Best general choice |
| night-time | Commonly found in British English | Acceptable, especially in UK contexts |
| night time | Open form | Less standard as a compound noun |
For example:
- Correct: I usually read at nighttime.
- Correct: Nighttime temperatures can be surprisingly low.
- Also acceptable: The streets are quieter at night-time.
- Less preferred: I usually read at night time.
Cambridge Dictionary lists nighttime as a noun meaning the time when it is dark, while its learner dictionary also records night-time as a form used for the same meaning.
So, if you are asking “which is correct, nighttime or night time?”, the safest modern answer is nighttime.
What Does “Nighttime” Mean?
Nighttime refers to the period of the day when it is dark, generally from evening until morning.
For example:
- The city looks completely different at nighttime.
- Some animals are more active during nighttime.
- Avoid driving alone at nighttime if the road is unfamiliar.
- The temperature usually drops during the nighttime hours.
Cambridge defines nighttime as the time in a 24-hour period when it is dark.
The word can function naturally in expressions such as:
- nighttime activities
- nighttime routine
- nighttime temperatures
- nighttime driving
- nighttime entertainment
- nighttime curfew
- nighttime hours
Is It “Nighttime” or “Night Time”?
The main difference is spelling rather than meaning.
“Nighttime” — one word
Nighttime is a closed compound word. It is the preferred form in modern American English and is widely recognized internationally.
Examples:
I enjoy walking in the park during nighttime.
The restaurant is especially busy at nighttime.
Children often have different nighttime routines.
Oxford’s American English dictionary lists nighttime as a noun and defines it as the time when it is dark.
“Night time” — two words
Night time is understandable because night and time are both ordinary English words. However, when they are being used together as the established compound meaning “the period of night,” nighttime is generally the cleaner choice.
That does not mean every appearance of night time is automatically a grammar error. English allows words to be used separately when the context calls for it.
For formal writing, however, choosing the established compound nighttime avoids unnecessary uncertainty.
Nighttime or Night-Time: What About the Hyphen?
There is a third form that often causes confusion: night-time.
This version is especially associated with British English and appears in reputable British-oriented dictionaries. Oxford’s Advanced Learner’s Dictionary gives night-time as a noun and defines it as the time when it is dark.
Cambridge also records night-time in its learner dictionary.
So you may encounter all three forms:
- nighttime
- night-time
- night time
But they are not equally common in contemporary standard usage.
Which form should you choose?
A simple rule is:
American English: Choose nighttime.
British English: night-time is acceptable, although nighttime is also widely used.
Professional or general international writing: nighttime is usually the safest choice.
Nighttime or Night Time in US English
If your audience is in the United States, nighttime is the clear choice.
American English commonly forms compound words by combining two words into one. Nighttime follows the same pattern as words such as:
- daytime
- nighttime
- sunrise
- sunset
- midnight
Oxford’s American English entry specifically gives nighttime as the noun form.
Examples in American English
- The park closes during nighttime hours.
- She has a relaxing nighttime routine.
- The city becomes quieter at nighttime.
- Some animals are only visible during nighttime.
If you are writing a blog, essay, website, business document, or social media post for a US audience, nighttime is the best spelling to use consistently.
Nighttime or Night Time in UK English
British English can be a little less straightforward.
Oxford’s Advanced Learner’s Dictionary lists night-time as the noun form, with examples such as “a night-time curfew” and “night-time entertainment.”
At the same time, nighttime is also recognized in English dictionaries and is used in British contexts.
This means that the UK spelling question does not have quite as rigid an answer as the US version.
If you are specifically following traditional British usage or a house style that favors hyphenated compounds, night-time is a sensible choice.
If you are writing for a broad international audience, nighttime is simpler and widely understood.
Nighttime or Night Time in Canada
Canadian English often sits between American and British conventions, so writers may encounter both nighttime and night-time.
However, if you want one consistent spelling for general Canadian English writing, nighttime is a practical choice.
The important thing is consistency. If your publication, employer, school, or organization follows a particular Canadian style guide, follow that guide over a general spelling preference.
For example:
- The park is closed during nighttime hours.
- The city has introduced new nighttime safety measures.
- Nighttime temperatures can fall rapidly.
There is no need to change the meaning simply because the spelling convention differs.
What Does the Oxford Dictionary Say About Nighttime?
This is one of the most common questions people ask when researching nighttime or night time Oxford Dictionary.
Oxford’s Advanced Learner’s Dictionary lists night-time as a noun in its British English entry. It defines the word as “the time when it is dark” and gives examples involving nighttime curfews, visits, entertainment, and other activities.
Oxford’s American English dictionary, however, lists nighttime as one word.
That distinction is useful because it demonstrates how spelling can vary according to regional English.
In other words:
- Oxford British English: night-time
- Oxford American English: nighttime
This is one reason you may see different answers depending on which dictionary you consult.
Nighttime or Night Time AP Style
If you are following AP style, use nighttime as one word.
The Associated Press style guidance lists nighttime without a hyphen. A published AP style guide reference specifically gives “nighttime” and indicates that it should not be hyphenated.
So journalists, content writers, editors, and communications professionals following AP style should write:
Nighttime
rather than:
Night-time
or:
Night time
AP-style examples
- The event will continue into the nighttime hours.
- Police increased nighttime patrols.
- The company introduced a new nighttime delivery service.
If your publication uses AP style, consistency matters. Once you choose nighttime, use it throughout the article.
Nighttime or Night Time Grammar: Is “Night Time” Wrong?
Not necessarily.
This is where spelling and grammar can get confused.
Night time is made up of two correctly spelled words, so simply writing the two words does not create a grammatical disaster. However, when you are using the expression as the established noun referring to the period of night, nighttime is generally the more standard modern spelling.
Think of it this way:
nighttime = the established compound noun
night time = two separate words that may appear together in certain contexts
For most ordinary sentences, there is little reason to choose the open form when the closed form is available.
Compare these sentences
Preferred:
I have a relaxing nighttime routine.
Less standard:
I have a relaxing night time routine.
The first version is cleaner and more conventional.
Is It Spelled “Nighttime” or “Night Time”?
Yes, this is another way of asking the same spelling question.
The preferred spelling in modern American English is:
nighttime
It is a single word.
If you are writing for a British audience, night-time may also be appropriate depending on the style you follow.
Therefore, if you are unsure and simply need the safest general spelling, choose nighttime.
Common Examples of “Nighttime”
Here are some natural examples you can use as a reference:
As a noun
- Nighttime is my favorite part of the day.
- The temperature falls considerably at nighttime.
- The animals become active at nighttime.
Before another noun
- She follows the same nighttime routine every evening.
- The hospital has increased its nighttime staff.
- We were warned about nighttime traffic.
- The city has improved nighttime security.
In everyday conversation
- I don’t usually go out at nighttime.
- The neighborhood feels different at nighttime.
- I prefer working during the day rather than nighttime.
In some of these sentences, simply using at night may sound even more natural.
“At Night” vs. “At Nighttime”
There is an important style point here: nighttime is correct, but it is not always the most natural choice.
Native speakers frequently say at night.
Compare:
I usually study at night.
I usually study at nighttime.
Both are understandable, but the first sounds more natural in everyday conversation.
Similarly:
The streets are quiet at night.
often sounds more natural than:
The streets are quiet at nighttime.
So don’t force the keyword into every sentence. Good writing should prioritize natural language.
Nighttime vs. Night Time: A Simple Memory Trick
If you often forget the spelling, think about the word daytime.
We normally write:
daytime
not:
day time
Because nighttime follows the same pattern, remembering daytime can make the spelling easier:
daytime → nighttime
This is especially useful when you’re proofreading quickly.
Nighttime or Night-Time: Why Does English Have Different Forms?
English compounds do not always settle into one spelling immediately.
Words can develop through several stages:
- Two words may initially be written separately.
- A hyphen may later connect them.
- The combination may eventually become a closed compound.
Not every compound follows this exact historical path, but variation is common in English spelling.
That is why dictionaries and regional style guides can sometimes show different forms without one necessarily being a “mistake.”
The key is to identify the spelling preferred by the variety of English and style guide you are using.
Nighttime or Night Time Reddit: Why Do People Disagree?
If you search discussions on Reddit or other online forums, you may find people arguing about nighttime vs. night time.
That disagreement usually comes from differences in regional English, personal writing habits, dictionaries, and style guides.
Online discussions can be useful for seeing how people actually write, but they should not be treated as the final authority on standard spelling.
For a reliable answer, check established dictionaries and the style guide required for your writing.
In this case, reputable references show that nighttime is a standard form, while night-time is also established in British-oriented dictionary usage.
Nighttime vs. Nocturnal
Another word people sometimes confuse with nighttime is nocturnal.
They are related, but they do not work in exactly the same way.
Nighttime is a noun describing the period of night.
Nocturnal is an adjective meaning related to, happening during, or active at night.
For example:
- Nighttime can be very peaceful.
- Owls are nocturnal animals.
- The museum offers nighttime tours.
- Some animals have nocturnal habits.
Cambridge and Oxford both define nocturnal in terms of activity or events occurring at night.
Common Mistakes to Avoid
When writing about nighttime, watch out for these common errors.
1. Using “night time” everywhere
Although understandable, the open form is usually unnecessary when you mean the established noun.
Better: nighttime
2. Randomly switching between forms
Avoid writing nighttime in one paragraph and night-time in the next unless you are deliberately discussing regional differences.
Choose a style and stick with it.
3. Assuming British and American English must use the same spelling
They don’t always.
Oxford’s British-oriented entry uses night-time, while its American English dictionary uses nighttime.
4. Thinking a dictionary difference means one form is “wrong”
Different dictionaries can reflect different varieties of English. A British dictionary and an American dictionary may legitimately use different preferred forms.
Quick Guide: Which Spelling Should You Use?
Use this quick reference when proofreading:
- US English: nighttime
- AP style: nighttime
- UK English: night-time is established; nighttime is also used
- Canadian English: nighttime is a practical general choice
- Formal writing: nighttime is generally the safest choice
- Casual writing: at night is often the most natural expression
- Hyphenated form: night-time, particularly in British usage
- Two-word form: night time is less preferred as the standard compound
Frequently Asked Questions
Is it nighttime or night time?
Nighttime is generally the preferred spelling, especially in American English. Night time is understandable but less standard as a compound noun.
Which is correct, nighttime or night time?
Nighttime is the best general choice. In British English, night-time is also a recognized form.
Is “nighttime” one word?
Yes. Nighttime is a standard one-word compound noun, particularly in American English.
Is “night-time” grammatically correct?
Yes. Night-time is an established spelling, especially in British English. Oxford’s British English dictionary lists it as a noun.
Is “night time” wrong?
Not necessarily. The phrase is understandable, but nighttime is generally preferred when referring to the established concept of the period of night.
What does the Oxford Dictionary say about nighttime?
Oxford’s British English entry lists night-time, while its American English dictionary lists nighttime.
Does AP style use nighttime or night time?
AP style uses nighttime without a hyphen.
What is the UK spelling: nighttime or night time?
For traditional British dictionary usage, night-time is a recognized form. The unhyphenated nighttime is also encountered, so the appropriate choice can depend on the publication’s style guide.
What is the US spelling: nighttime or night time?
American English strongly favors nighttime as one word.
Is “nighttime” a noun or adjective?
It is primarily a noun, meaning the period when it is dark. It can also appear before another noun in combinations such as nighttime routine or nighttime activities.
Is “at nighttime” correct?
Yes. At nighttime is grammatically acceptable, although at night is often more natural in everyday English.
Why do some people write “night-time”?
Because English spelling varies by region and style. British-oriented dictionaries commonly record night-time, while American English commonly uses nighttime.
Final Verdict: Nighttime or Night Time?
So, is it nighttime or night time?
For most modern writing, especially US English, SEO content, business writing, and AP-style writing, “nighttime” is the safest choice. It is a standard closed compound and is widely recognized.
If you are writing specifically in British English, “night-time” is also a perfectly established form and appears in Oxford’s British English dictionary.
The two-word “night time” is understandable, but it is generally not the first choice when you simply mean the period of night.
The easiest rule to remember is:
US English → nighttime
British English → night-time is acceptable
General modern writing → nighttime
And when you want the most natural everyday expression, don’t forget that “at night” is often all you need.
Understanding small spelling differences like this can make your writing cleaner, more consistent, and easier to read. If you’re interested in more English spelling and grammar guides, exploring related word-choice questions can help sharpen your writing even further.
