What indications mean you should interrupt your journey?

You correctly identified all the signs that indicate you should interrupt your journey. In German traffic rules, signs of fatigue such as yawning frequently, having difficulty keeping your eyes open, and struggling to stay in your lane are clear warnings that your alertness is impaired. Continuing to drive in this state greatly increases the risk of accidents. Therefore, when you notice these signs, you should stop driving, take a break, or find a place to rest before continuing your journey. This helps ensure your safety and that of other road users.