He likes to write the kanji for 'nikuzuki'.

I'm tired of interacting with people, I need some time alone.

I got tired of interacting with people because I was dealing with them all day.

He continued his work overnight.

He is always working at night.

The sound of the night rain hits the window glass.

The sound of the night rain is hitting the window glass.

What should I make for supper tonight?

During the polar night, the sun does not rise even once.

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