Japanese by Example
Learning through examples in manga

Did you sleep properly with ちゃんと

カードキャプターさくら » Volume 4 » Page 88

During an overnight school trip, a classmate tells a ghost story right before bedtime. While everyone else easily falls asleep, Sakura is too scared to close her eyes. The next morning, when Sakura washes her face, Tomoyo hands her a towel.

さくら:
「ありがとーーー」
“Thank you!”
知世(ともよ):
「きのうは ちゃんと(ねむ)れました?」
“Were you able to properly sleep last night?”

Here, ちゃんと refers to sleep as one should, rather than being awake all night.