Here are some useful words and phrases related to the "night” .

Words

졸리다 - to be sleepy ( Adjective )

잠옷 - pyjama ( Noun )

수면 양말 - sleeping socks ( Noun )

양말 - socks ( Noun )

수면 - sleep ( Noun )

불면증 - insomnia ( Noun )

수면제 - sleeping pills ( Noun )

꿈 - dream ( Noun )

자각몽 - lucid dream ( Noun )

잠꼬대 - sleep talking ( Noun )

몽유병 - sleep walking ( Noun )

Phrases

잠을 자다 - to sleep

졸려 - I am drowsy ( Informal casual )

꿈을 꾸다 - to dream