The Big Dictionary of Dreams

by Martha Clarke
As in real life, alarms that appear in dreams are warnings against danger that must be taken into account to avoid unpleasant situations; especially if these images are frequent.

The oneiric alarms can be sirens, whistles, shouts, or light signals. In the latter case, if they are located in a door or window it means that people that you trust could betray you.

If it is yourself who sets the alarm off, then you must take on your projects as soon as possible; situations that could alter those plans may appear later.

Little Giant Encyclopedia

by Klaus Vollmar
Something needs to be activated; something must be done immediately (a dream of warning or a dream of war). Are you showing tendencies of too great a separation between conscious action and unconscious feelings or wishes.7 It could also be a reactive dream, after your alarm clock has gone off!

Dreamers Dictionary

by Garuda
Vision: An alarm going off is a warning to act swiftly on a present project. Setting off the alarm yourself: you are restless, impatient, and nervous; or you are getting unnecessarily worked up about somebody else’s problem. Depth Psychology: See Signal, Whistle.