Mark Wallinger’s contribution to this year’s Turner Prize is Sleeper (2004-05), a film of a performance in which, over a period of 10 nights, he dressed in a bear suit and wandered aimlessly around an art gallery in Berlin, startling unsuspecting passers-by.  He relives the long nights for TateShots.

The Turner Prize 2007, Tate Liverpool, 19 October 2007 - 13 January 2008