Yep, what MG said. I've had 3 now and my first was at 7.30pm so I get your worry. Ususally you're a bit groggy and the first few hours will fly by. I remember not really wanting to sleep those first nights, but knowing I should try. I had an amazing new person to learn about after all
In my experience the nurses generally were happy to look after bub that first night and bring in for feeds but I have generally co slept after the first one. Some hospitals have very strict policies though so maybe you could ask about that?