Why shouldn't you ride a bike at night?

Why is it generally advised against riding a bike at night? Could the reduced visibility pose a significant safety hazard, increasing the risk of collisions with pedestrians, vehicles, or obstacles? Is it because of the potential for accidents due to the lack of streetlights and other illumination sources? Additionally, might the chances of encountering criminal activity or unsafe situations escalate during nighttime hours? Furthermore, are there specific precautions or safety measures that riders should take if they must cycle after dark?