It gets cold at night.
I slept really badly last night.
I spent the night at Ted's.
He took the night ferry/train.
The phone rang in the middle of the night.
They're open from 7 in the morning until 10 o'clock at night.
Cracov is [an] interesing place and look[s] nice at night. (Skills for Life (Entry 1); A1; Polish)
We're seeing them on Saturday night.
I've been out every night this week.
Did you have a good time last night?
You can go to the disco and dance all night. (Skills for Life (Entry 1); A1; Polish)
He'd spent a sleepless night worrying about his exam.
Most of the rooms we stayed in did not have air-condition[ing], which caused many sleepless nights to the majority of us due to the intense heat. (Certificate in Advanced English; C1; Portuguese)