The Big Dictionary of Dreams

by Martha Clarke
Complaining in dreams is a sign that you are having emotional or economic problems in real life, and you are unable to ask for help. The dream, usually, is an expression of your pain and is a warning to go to others in difficult moments. However, this dream could also warn of your tendency to complain and is suggesting that you stop lamenting over a certain event in the past.

Dream Dictionary Unlimited

by Margaret Hamilton
Discontent revealed in order to correct and avert the situation