All Night
Sleepless Night, All Nighter
noun, verbal noun, の adjective
Penetrate the night and go on through to the morning. You were up all night and had a sleepless night aka all nighter.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
英語を徹夜で勉強するなんて、いかにもあの子らしいよね。
It’s just like her to study English all night.