I'm bushed. I'm going to bed.

我累坏了，要睡觉了。

《柯林斯英汉双解大词典》

I've had it! I'm going to bed.

我太困了！我要去睡觉了。

《牛津词典》

I'm tired—I'm going to bed.

我累了—我要睡觉了。

《牛津词典》

Hitting the hay simply means going to bed.

VOA: special.2009.09.20

But the last thing I remember I was going to bed from my fatal illness on the Isle of Elba.

但我最后的记忆就是在厄尔巴岛的病榻上。

耶鲁公开课 - 死亡课程节选

They'll say, "Oh, he must think it's not-- He'll--He's going to check under the bed.

他们会说,"他正要去检查床下面"

耶鲁公开课 - 心理学导论课程节选

Police later raided the flat just before Nesbitt and his partner were going to bed.

BBC: Lawyer Gerard Nesbitt jailed over 31kg cannabis haul

When people fly west, they have to stay up later before going to bed.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist

That means going to bed every night a little wiser than when you woke up.

FORBES: Let the Learning Begin