PFB is sometimes sleeping peacefully, then out of nowhere he starts screaming - full on loud screams, not whimpers/grizzles that gradually build up iykwim. His eyes are still closed, and when I pick him he seems to only wake then. He looks confused and frightened, and keeps screaming for a few minutes while I try to comfort him, then is very clingy for a while.
He doesn't seem hungry, or to need a change or burp and I can't find anything in his cot that could be hurting him.
Any ideas? Could he just be having bad dreams that frighten him and, if so, what can I do to help him?