Translation guide
A very brief, involuntary episode of sleep or loss of attention, often lasting a few seconds, typically caused by fatigue or sleep deprivation.
Describing a momentary, unintended lapse into sleep, often while trying to stay awake.
Describing a momentary lapse in concentration, not necessarily involving actual sleep, but a blanking out.
Literally 'a momentary loss of consciousness.' Used when the microsleep involves a brief blackout or lack of awareness.
疲れていると、一瞬の意識消失が起こりやすくなる。
When you're tired, momentary lapses of consciousness become more likely.
Microsleep is involuntary and often dangerous. Do not use words like 昼寝 (ひるね, nap) or 仮眠 (かみん, catnap) which imply intentional rest.
マイクロスリープは昼寝とは全く異なります。
Microsleep is completely different from a nap.
The loanword マイクロスリープ is the most precise term and is understood by many Japanese speakers, especially in contexts like driving safety or sleep science. In casual talk, you can describe the experience with phrases like 一瞬寝てしまった (I fell asleep for a moment).
The direct loanword from English, widely understood in medical and technical contexts. It refers specifically to the phenomenon of brief, involuntary sleep episodes.
運転中にマイクロスリープが起きると非常に危険です。
It is extremely dangerous if a microsleep occurs while driving.
Literally 'a momentary doze.' A more colloquial way to describe a microsleep episode, emphasizing the briefness and involuntary nature.
会議中に一瞬の居眠りをしてしまった。
I had a momentary microsleep during the meeting.
A more literal translation, 'momentary sleep.' Used in formal or medical explanations but less common in everyday speech.
睡眠不足により瞬間的な睡眠が生じることがあります。
Momentary sleep can occur due to lack of sleep.
A common verb meaning 'to zone out' or 'to be spaced out.' It captures the loss of focus aspect, though it may not imply actual sleep.
運転中にぼんやりして、危うく事故になりかけた。
I zoned out while driving and almost had an accident.
A noun meaning 'distraction' or 'inattention.' It describes a state of reduced focus, which can be a result of microsleeps, but is a broader term.
注意散漫な状態での作業はミスを招く。
Working in a state of inattention leads to mistakes.