I posted a similar thing today, Jake does scream, but after falling asleep about an hour later. But it is a real "help me now"ear piercing noise, but only lasts for 30 secs and he's usually fast asleep after.
he makes a real row when winding down, if you didn't know him you'd think he was playing!
I suppose we are lucky in a way, although its strange, at least they do have the skills to fall asleep alone!