He participates in rigorous winter training every year.

Fuyumiko is my best friend.

I plan to spend this year's winter break at home without going anywhere.

Fuyoshi-kun, have you finished today's homework yet?

Kaya is my best friend.

He finished his work and went home at midnight.

He was working until late at night.

He is clearly a night owl, working late into the night and sleeping late into the morning.

An owlet moth is an insect that is active at night.

In Hinduism, Yama is considered the god who judges the souls of the dead.