The space under the bed is the classic hiding place of childhood fears, read as worries you avoid looking at directly. Finding something harmless there stands for a fear that shrinks once faced.
When this appeared in your dream, what were you feeling?
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.