Dreams dictionary: Sigh
Dreams dictionary: Interpretation 1
To hear sighing or dream that you are sighing indicates that you are feeling overwhelmed by waking problems. Alternatively, the dream signifies "a sigh" of relief.
Dreams dictionary: Miller Dream Interpretation
To dream that you are sighing over any trouble or sad event, denotes that you will have unexpected sadness, but some redeeming brightness in your season of trouble. To hear the sighing of others, foretells that the misconduct of dear friends will oppress you with a weight of gloom.