The beeping line of a heart monitor is read as close watch on what keeps you going. Tradition links it to anxious attention to your feelings, measuring each rise and fall.
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.