Sounds like going from one sleep cycle to another. Sometimes babies cry when this happens. They can also grunt and talk. I don’t think it’s anything to worry about.
Sounds like he's moving between sleep cycles
Maybe a nightmare. I had nightmares as a baby, too.
@Heather he woke up crying after this and took me a good 20 minutes to settle him. I couldn’t get the crying afterwards, but the crying is worrying
Sounds like he is dreaming
he may be in active sleep or dreaming
my son has had nightmares a few times where he wakes up crying. i wouldn’t worry about it but i totally get where you’re coming from.