Laughing
Laughing in a dream is a scene of the mind loosening, and reads broadly well. Traditional reading took laughing hard as a blockage opening, and laughing together with others as a good omen of things opening up between people. Some old readings did turn excessive laughter around and said weeping would follow, so take that as a call to watch yourself when you are most elated. Forced laughter signals a feeling you are hiding.
Laughter in a dream does not only come from good spirits; it also arrives when something long clenched finally lets go. Old dream books took the sound of laughter as the sound of energy moving, and weighed even whether it rang out or was swallowed. There is also a strand that weighed loud laughter and swallowed laughter differently.
Readings by Situation
Laughing hard
A good omen that something blocked opens. Tradition read laughter as vitality circulating. If something has felt stifling for a long time, read it as the moment it clears.
Laughing together with others
Laughter overlapping is what you hear. Tradition saw laughing together as harmony, and what is worth noticing here is whether the people laughing are people you actually see these days.
Laughing excessively
Some old books read this back to front and put tears at the end of it. The old readers noticed that the longer laughter runs, the sooner the breath gives out before the sound does.
Forced laughter
A sign of a feeling you are hiding. If your heart felt heavy while laughing, that feeling is the answer. Seeing what you are holding in lightens it.
A laughing dream is not a bad omen. Even the old inverted reading is a call to watch yourself, not a forecast of misfortune. If forced laughter recurs, look at how you have been feeling.