Crying in sleep?

Does anyone else baby cry while they’re asleep?

My little guy is almost 4mo. Recently (like in the past 2-3 weeks) he’s been having these weird crying fits but not really waking up? It can be a few second that he just screams and cries then boom, straight face knocked back out. Other times it can be a minute or two, but he doesn’t fully wake up? It wakes me up at night of course. I was running to grab him for a few nights, but I stopped when I realized he was just going right back to sleep. Bad dreams maybe? Sometimes he will cry for longer than a couple minute and when I go to check on him, he opens his eyes, looks at me, then goes right back to sleep.

I’ve had to gauge when he’s actually waking up vs this weird sleep crying. I was used to him smiling in his sleep, but now I’m like… is he having a ton of bad dreams? I know that sounds silly but :( I hope he’s not!