Christmas cactuses are popular holiday plants that require specific conditions to thrive. It's important to ensure they're getting enough light, moisture, and nutrients. If your cactus is dropping leaves or looking wilted, it may be getting too much or too little water or light. Make sure you're not over-watering or underwatering it, and that it's getting enough bright, indirect sunlight. With the right care, your cactus should bounce back in no time!