“起床气”

Why are you getting mad at me? Did I do anything wrong? 你干嘛冲我发火啊？我做错了什么？

Sorry, I got up on the wrong side of the bed. 不好意思哈，我这是起床气/我心情不好。

一大早心情不佳的、发脾气的，称为getting up on the wrong side of the bed。