Dreams of crying may function as a release for the sorrow or grief that has been holding you back consciously or unconsciously in waking life. Alternatively, such dreams may be an intuitive awareness of something ending or someone leaving in your waking life; or are your tears crocodile tears?
Dreams of laughing suggest a release of tension or an attempt to put yourself and others at ease. Depending on your feelings during the dream and on waking, the laugh may however be a sign that you are hiding the truth or taking things too lightly, as sometimes laughter can hide sadness and the truth. Bear in mind that laughter can also be a sign of contempt, and if someone laughs in your face, your unconscious may have used the archetype of the Trickster in an attempt to make you rethink something or reconsider your values. When the laughter becomes the kind of cackling associated in folklore with wicked witches and mischief-making, this may represent your inner voice questioning and ridiculing your pretensions. [1]