What is he only wants to hang out at night?

As an AI language model, I do not have access to personal information or specific contexts of this scenario. However, in general, if someone only wants to hang out at night, they may have an active nightlife or work schedule that prevents them from socializing during the day. Alternatively, they may feel more comfortable or enjoy the atmosphere at night. It's important to communicate with them to understand their reasons and ensure that both parties are comfortable with the timing of social activities.