Opposite of insomnia?

I have an unusual worry to discuss today 🙈 ever since I was a child, I’ve always slept on time and woke up on one time. Hence, it was difficult for me my entire life to have sleepovers. I would be the first one to fall asleep. Planning a baby, I’m so scared of what’ll happen once the baby is born. How will I wake up every two hours to feed a baby? My sleep is so weak! I’ve always read posts about insomnia but never about anything like this. Any thoughts? 🙈