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》

You done watching it? I'm going to bed.

VOA: standard.other

If I'm on leave and it's blowing a gale I can look out at the sea and think thank goodness I'm going to be in bed tonight but when it's nice weather I can look forward to going out and doing my next ship.

BBC: Ӣ���˵Ĺ���

"I can skip a dinner or two to pay off a credit card, but I'm going to have this bed for 20 years, " she said.

WSJ: Signs Consumers Have Changed Spending Behavior

After what I've been through this week, I realise from now on, that's the only place I'm going to get an extra hour in bed.

BBC: News | UK Politics | Charles Kennedy's speech in full