在英语中，我们常常会用 "insomnia" 来表示失眠。这个词来源于拉丁语 "insomnia"，意思是"无眠"。

以下是一些使用 "insomnia" 的英文例句：

"I've been suffering from insomnia for the past few weeks." (我过去几周一直失眠。)
"Insomnia is a common sleep disorder that affects milpons of people worldwide." (失眠是一种常见的睡眠障碍，影响全球数百万人。)
"There are many different treatment options for insomnia, including medication and therapy." (失眠有很多不同的治疗方案，包括药物和治疗。)