A sieve separates what stays from what passes through, so tradition reads it as sorting, judgement and letting go of what is not needed. A leaking sieve stands for effort that seems to slip away.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.