It appears that my father has taught First-born the guaranteed way of waking me up. The ancient art known as The Wet Grolly.
Its a hideous thing, whereby the attacker licks a knuckle (usually of the index finger) and drives it into the ear of the prone victim, usually with a rotating motion.
After she'd peeled me off the ceiling (at 5am) she waved the Toy Story 2 DVD in a hopeful fashion.
I can only hope that my father has yet to teach her The Nagasaki Nose Throw.