Swarms of insects in dream can depict instinctual urges in life, such as sexual urges. Swarms may also represent small children or the sperm swarming toward the ovum, and therefore may be suggesting issues to do with pregnancy. The power of the group can additionally be suggested by a swarm; where one insect seems to be moving aimlessly, large numbers do not. Your dream swarm might be telling you that you can often only succeed in changing matters by group effort. As Jiminy Cricket suggests, insects can also represent your conscience, guilt and feelings you might want to forget; perhaps insects represent these areas because they live their lives in our house and garden largely unseen, although we sometimes sense their presence. In this sense, a swarm might represent being overwhelmed with guilt.
If you see a swarm of insects around you, this suggests malicious rumors are being spread about you, but if you manage to kill the insects or escape, you will find an easy remedy for your problems.
If insects are taking something apart in your dream, this suggests you may be in the phase of ending something and you need to complete that process before starting something new.
If the insects have invaded your food or contaminated something in your dream, consider whether your lifestyle is a healthy one. A dream of killing or spraying insects may also recall childhood hostility towards a sibling that may persist into later life.
If the insects are flying off, this may represent children leaving home or the end of a particular problem that has been upsetting you.
[1]