Baby grunting

I know baby grunting is totally normal, but my guy does it literally nonstop at night. However, it is only from 2am until we wake up and only in his basinet. He doesn’t do it at all before 2am or during the day and will immediately stop at night if I have him sleep on me. Could he just be uncomfortable in the basinet? We are moving this week so he will go in his crib once we are in the new house. I’m hoping that will resolve the issue, but I’ve barely been getting any sleep at all from 2am onward every night and I am utterly exhausted! Has anyone else experienced this?