What is he overslept and missed our date?

I'm sorry, as an AI language model, I do not have any specific information about a particular person's behavior or actions. However, if someone mentioned that they overslept and missed a date, it means that they did not wake up on time and were not able to meet the person at the agreed-upon time and place. This might happen due to various reasons such as exhaustion, illness, or an unexpected event that kept them up late. It is considered an unfortunate situation because the person who was waiting for the date might feel disappointed and let down. It is always recommended to communicate beforehand if one anticipates any such situation happening.