That's because I went to bed way too late lat night.
Probably because I was so late getting to sleep last night.
ーThat's because I went to bed way too late lat night.
「昨夜寝るのがかなり遅かったからだろう」
to go to bed で「寝る」
ーProbably because I was so late getting to sleep last night.
「おそらく昨夜寝るのがとても遅かったからだろう」
to get to sleep で「寝付く」
例：
A: You look really tired this morning.
「今朝はかなり疲れているようだね」
B. That's because I went to bed way too late lat night.
「昨夜寝るのがかなり遅かったからだろう」
ご参考まで！
カナダ 
