expression, ichidan verb
disturb one's sleep
A set phrase meaning to interfere with sleep, often used in contexts like noise, light, or worry.
隣の部屋の騒音が睡眠を妨げる。
The noise from the next room disturbs my sleep.
カフェインは睡眠を妨げることがある。
Caffeine can sometimes disturb sleep.
寝不足 is the state of not having enough sleep, while 睡眠を妨げる is the action or cause that disturbs sleep.
Compound of 睡眠 (sleep) + を (object marker) + 妨げる (to obstruct, disturb).