Ambient music and a darkened light show
A strange experience at the Tate Modern, and one I heartily recommend.
I happened to be there this lunchtime when I realised the massive turbine hall had been plunged into darkness. Ambient music was playing and keeping time were light boxes located all around the hall. It transformed the otherwise quite serene space into a sound box that seemed to place me at its centre.
As the scene unfolded I found myself drawn deeper in, becoming more relaxed until finally I settled on the carpet placed at one end of the hall, mingling with some fellow visitors. Almost unable to summon the energy to move I went deeper and yes, I may have fallen asleep.
It was a bizarre experience, one that was truly profound not only for being so unexpected, but also for the effect that it had on me.