Baby cries/makes noises in his sleep

Does your baby make noises in his sleep? My boy is 3 weeks. He used to be a silent sleeper. Now he seems very restless. He doesn’t roll but he kicks around and wiggles to move around the bassinet. He also makes a lot of noises. He sounds like he is hiccuping, making coo noises, or has congested breathing. Well now he has started to cry but he is still totally asleep. He will cry for about 15 seconds with his eyes totally closed and then get super calm and stay asleep. But it can be super loud like he is wailing. I wake up at night from hearing it and think he is awake but he isn’t. He is a really good sleeper and has been from the beginning. He can easily sleep 4 hours at a time and at times has even slept up to 7 hours at night. Is he just dreaming or reacting in his sleep? Is something wrong and I need to wake him up? It’s just a worrying feeling because I feel like something is wrong if he cries but he is totally asleep.