睡すい眠みん負ふ債さい

noun

sleep debt; sleep deficit

Accumulated lack of sleep over time, often discussed in health contexts. The term is a direct calque from English.

• 睡すい眠みん負ふ債さいがたまると、集しゅう中ちゅう力りょくが低てい下かする。

  When sleep debt accumulates, concentration declines.

• 週しゅう末まつに寝ねだめしても、睡すい眠みん負ふ債さいの解かい消しょうには不ふ十じゅう分ぶんだ。

  Even if you sleep in on weekends, it's not enough to repay your sleep debt.