I am a plane sleeper, I barely make it to take off without being out for the count, so definately privacy for me. My friends know when they travel with me, to pack lots to keep them occupied, as I am no company. However as a person, I am of the very social variety, and love a good chat, but put me on a plane, and am a gonner.

My usual line is "please could I have a 2 litre bottle of water and do not disturb me, as I will sleep until landing, and I wont disturb you either, deal?" ... It usually goes down well, as one less pax to worry about.