She looks like such an angel when she drools on a stranger's pants.
According to the description on the video posted by Steve Cullum (the conscious passenger), he "tried lifting her up, shaking her, and startling her," but no dice. Eventually, the drowsy traveler switched seats and fell asleep on some other guy.
We would kill to be able to sleep like this on a plane. To get to her state of somnolent bliss we'd need at least two ambien and several airplane bottles of Woodford Reserve. And there's always the risk that that'll backfire and just make us want to hit the aisle and party.
Anyway, she should buy a neck pillow. Props you right up. Keeps your face off of strangers' genitals. Neck pillows. Everyone needs one.