An art gallery in London recently exhibited the actress Tilda Swinton sleeping in a large glass box in the centre of the room.

A similar exhibition also occurred in Germany - rather than being restricted to a single sleeping art form, it involved a number of beds being available within the gallery for office workers, or anyone else for that matter to use at any time during the day - provided they didn't mind being used as an art exhibit.

Tired souls bedded down at their own leisure and were watched by fascinated and bemused art lovers as they slumbered.

What a lovely idea.