The Complete Guide to Interpreting Your Dreams

by Stearn Robinson - Tom Corbett
To groan in your dream signifies some kind of financial embarrassment; make sure your tax accounts are in good order.

If in your dream you heard someone else groan, it indicates a period of petty annoyances.

Strangest Dream Explanations

by Dream Explanations - Anonymous
Dreams of groaning signify that your animal instincts are surfacing, and you are unable to contain your feelings, whether they be those of pleasure or pain. Consider the feeling tone.