I'm tired — I'm going to bed.

我累了，我要去睡觉。

I'm going to bed now. Are you coming?

我现在要睡觉了。你来吗？

I'm exhausted - I'm going to bed.

我累坏了——我要睡觉了。

Depressed, I'm going to bed, ah, let me ask you, dear.

郁闷，我要去睡觉了啊，求你放过我吧，亲爱的。