短たん時じ間かん睡すい眠みん者しゃ

noun

short sleeper; person who needs little sleep

A person who naturally requires only a short amount of sleep, typically 6 hours or less, without negative effects. Often used in medical or lifestyle contexts.

• 彼かれは短たん時じ間かん睡すい眠みん者しゃで、毎まい日にち4時間よじかんしか寝ねない。

  He is a short sleeper and sleeps only four hours every day.

• 短たん時じ間かん睡すい眠みん者しゃは遺い伝でん的てきな要よう因いんが関かん係けいしていると言いわれている。

  It is said that genetic factors are involved in being a short sleeper.