Hearing an alarm in a dream suggests something is trying to get your attention and wanting you to wake up. Basically it is to get your attention to do something – what are you supposed to do?
But there are so many types of alarm signal; for instance a telephone ringing is an alarm signalling you to answer. It could be an alarm clock, or fire station alarm, or an alarm signal telling you it is time to start of stop work; so decide what type of alarm it is and what context it is in. Context is the essence!!
Useful Questions and Hints:
What is the alarm asking?
What sort of alarm is it?
Is it important and what do you do about it?
What is the context it appears in – see Context.