Running in a dream often carries urgency without a clear finish line -- effort that isn't translating into progress, or a sense that you're working hard just to keep pace with something. It can reflect a real situation where you feel like you're putting in energy without seeing the results you expected.
The comets should be used when they appear and in what they rule; just as fixed stars, they have to be used according to each one's nature. - Picatrix (Andalusia, ~1000.AD)