My baby has a Sixth Sense. (And no, he cannot see dead people.) He has an acute awareness of his mother's sleeping status.
Every night as I am falling asleep, right as I am hanging on the precipice ready to fall blissfully into unawareness the screaming begins, without fail.
I don't know how he does it, but every night it is the same. Why he can't start screaming ten minutes earlier is beyond me. But he knows. He knows.