我昨天实在是太累了，所以今天上课的时候就睡着了。

I was so tired yesterday that I dozed off in class.

youdao

昨天我在课堂上睡着了。

I fell asleep in class yesterday.

youdao

昨天晚上，我很早就睡着了。

Last night, I fell asleep very early.

youdao

昨天晚上，我很早就睡着了。

Last night, I fell asleep very early.

youdao