Dreaming about walnuts can signify an excessive mental focus on a particular task, which may be causing you to expend unnecessary energy. It's a sign that you might be wasting your time and resources on something that isn't as important as it seems. On the flip side, walnuts in dreams can also symbolize joy and abundance. If you dream of cracking a walnut, it could be a warning that your high expectations may not materialize as you hoped.