I set my alarm clock for 4:30.

我把闹钟定在4:30。

《柯林斯英汉双解大词典》

I forgot to set my alarm and I overslept.

我忘了上闹钟，所以睡过了头。

《柯林斯英汉双解大词典》

My alarm was set for 5:00 A.M.

我的闹钟设在早上五点。

youdao

I hear, perhaps, the sounds of the cars outside my house, my alarm clock ringing, what have you.

我听到,轿车的声音从室外传来,或是闹钟的铃响,随你想象

耶鲁公开课 - 死亡课程节选

I must have forgotten to set my alarm.

我肯定是忘记设闹钟了。

Must 实战 - SpeakingMax英语口语达人

To my alarm, long tracts of meditative material, representing months of toil, suddenly began falling away.

WSJ: Manil Suri, Author of The Death of Vishnu, on Narrators | Word Craft

The meeting cancellation resets not only my alarm clock but the coffee machine as well.

FORBES: Making The Internet Of Things A Reality: Mobility Meets Big Data In The Cloud -- "Triple Word Score"!

Well, what if my calendar could talk to my alarm clock across the Internet?

FORBES: Making The Internet Of Things A Reality: Mobility Meets Big Data In The Cloud -- "Triple Word Score"!