Mark Wallinger, The Unconscious, 2010. Till February 19 on show in Museum De Pont, Tilburg (The Netherlands). 
Wallinger took photographs from the internet of people who have fallen asleep on public transportation. The cell-phone snapshots taken by fellow passengers show a complete loss of self-control, defenselessness and surrender. Carefully guarded egos have vanished behind the literal and figurative vulnerability of a gaping mouth, a head nodding off, an exposed neckline.