A UFO is often how our guides show up in dreams when we are first absorbing spirituality and the concept of super intelligent beings watching over us. It's a perfect symbol for that.
Guides / Angels watch over us throughout our lives and orchestrate the events and people we need to help us achieve our life purpose. They are engaged in your life by prior agreement. If you want their help with other things you have to ask. Respect for free will precludes them from helping unless invited to do so.