Mountain biking at night without lights is very challenging, but there are several ways to improve safety and feasibility: 1. **Choose familiar routes**: Make sure you ride on a path you are familiar with so you can better navigate the route even in the dark. 2. **Use reflective gear**: Wear cycling clothing with reflective materials to ensure that you are more visible to others in low-light environments. 3. **Use moonlight and starlight**: Choose a night with a bright moon and use natural light to illuminate the front. Try to avoid riding without light. 4. **Effective eye adaptation**: Give your eyes some time to adapt to the darkness before setting off, so that you can better see the surrounding environment. 5. **Slow down**: When riding in the dark, reducing your riding speed can improve safety and better respond to unexpected situations. 6. **Learn night riding skills**: Practice how to maintain balance and control in low-light environments and gradually adapt to the feeling of riding at night. 7. **Clear signals and voice communication**: If you are traveling with a partner, make sure to agree on communication signals and voice prompts in advance to enhance the safety of the group. 8. **Consider using a helmet light**: Although you hope not to use a light, a small adjustable helmet light can provide you with the necessary illumination while keeping your hands free. 9. **Use touch and hearing**: In the dark, you often need to rely more on touch and hearing, pay attention to changes in the road surface and the sounds around you, so as to better judge the environment. In any case, safety comes first when mountain biking at night. Strictly evaluate the conditions of your environment and your own abilities. It is recommended to use lights when necessary to ensure safety.