na-adjective, noun
lack of sleep; insufficient sleep
Common everyday word for not getting enough sleep. Often used in the pattern 寝不足だ or 寝不足で.
昨日は寝不足で、一日中ぼんやりしていた。
I was sleep-deprived yesterday and felt foggy all day.
寝不足が続くと、体調を
If lack of sleep continues, you become more prone to getting sick.