He was working throughout the entire night.

The phone rang in the middle of the night.

He was working late at night.

He was able to recall the poem immediately.

It's difficult to remember new words.

It's difficult to remember his name.

I couldn't sleep because I could hear the howling of a dog in the middle of the night.

The dog howled in the middle of the night, and I couldn't sleep.

His threat is just a bluff.

My dog is very smart.