noun
short sleeper; person who doesn't need much sleep
Refers to someone who naturally requires less sleep than average and functions well on short sleep. The Japanese term 短時間睡眠者 is a synonym.
See also: 短時間睡眠者 (たんじかんすいみんしゃ)
彼はショートスリーパーで、毎日4時間しか寝ない。
He is a short sleeper and only sleeps four hours a day.
ショートスリーパーは遺伝的な要因が強いと言われている。
It is said that being a short sleeper has strong genetic factors.