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.
He is a short sleeper and sleeps only four hours every day.
It is said that genetic factors are involved in being a short sleeper.
Opposite: a person who needs a long amount of sleep.
Insomnia; a sleep disorder, unlike being a natural short sleeper.
Compound of 短時間 (short time) + 睡眠 (sleep) + 者 (person).