Translation guide
The English phrase 'fall asleep' refers to the process of transitioning from wakefulness to sleep. In Japanese, the most common and natural equivalent is 寝る (neru), which covers both 'go to bed' and 'fall asleep' depending on context. For emphasizing the moment of falling asleep, 眠りにつく (nemuri ni tsuku) or 寝入る (neiru) are used. This guide covers natural expressions for different nuances.
To transition from being awake to being asleep, often used in everyday conversation.
The most common and versatile verb for 'sleep' or 'go to bed'. In context, it often implies falling asleep. Use with care: it can mean 'lie down' or 'go to bed' without necessarily being asleep.
A slightly more literary or formal way to say 'fall asleep', emphasizing the entry into sleep. Common in written Japanese or polite speech.
He quietly fell asleep.
Specifically means 'fall asleep', focusing on the moment of drifting off. Often used in the past tense.
Means 'fall asleep', often used for children or when someone finally falls asleep after difficulty. Can also imply being bedridden.
To fall asleep without intending to, such as dozing off during a meeting or while watching TV.
Means 'doze off' or 'fall asleep unintentionally', especially in a place where one shouldn't sleep (e.g., class, meeting).
To fall asleep quickly or easily because of tiredness or comfort.
Means 'sleep soundly' or 'fall into a deep sleep'. Often used when one is very tired.
To fall asleep in the middle of an activity, like reading or eating.
Pattern meaning 'fall asleep while doing ~'. Attach to the masu-stem of a verb.
While 寝る can mean 'fall asleep', it often simply means 'go to bed' or 'lie down'. To clearly express 'fall asleep', use 眠りにつく or 寝入る, or add context like すぐに (immediately).
I went to bed but couldn't fall asleep.
Both mean 'fall asleep', but 寝入る focuses on the moment of drifting off, while 寝付く often implies finally falling asleep after some difficulty, or is used for children. 寝付く can also mean 'be bedridden'.
気がついたら寝入っていた。
Before I knew it, I had fallen asleep.
赤ちゃんがやっと寝付いた。
The baby finally fell asleep.
I accidentally fell asleep during the meeting.
Onomatopoeic phrase for nodding off or being half-asleep. Describes the state of drowsily drifting off.
I dozed off while watching TV.
Slang/internet term meaning 'fall asleep unintentionally', often while doing something like gaming or chatting online.
Last night I fell asleep while gaming.
I was so tired that I fell sound asleep.
Colloquial term for 'sleep like a log' or 'crash out'. Implies falling into a very deep sleep, often from exhaustion.
I crashed out yesterday.
Literally 'fall asleep immediately'. Emphasizes the speed of falling asleep.
I fell asleep as soon as I got into bed.
I fell asleep while reading a book.
Pattern meaning 'fall asleep while in the middle of doing ~'. More literary than ながら.
I fell asleep while studying.
なかなか寝付けなかった。
I couldn't fall asleep for a long time.