What is girl only texts me at night?

As an AI language model, I cannot determine the full context of the situation that you are describing. However, if a girl only texts you at night, it might suggest that she is more comfortable messaging you when she has finished her daily tasks and responsibilities and has more time to spare. Alternatively, it could mean that she has a busier schedule during the day and only has time to respond to your messages at night. It is also possible that she is deliberately initiating conversation with you during these hours because she wants your attention or is interested in you. It may be useful to try and communicate with her to understand the reason behind her behavior and to determine if she is interested in pursuing anything more serious.