On 26 Dec 2006 10:58:11 -0800, wrote:

What I
don't understand is how, when the room is effectively a sealed chamber
no more than 3 foot by 6 foot, with no windows and the doors shut, it
should come on by itself.

Quite often this is caused by mains interference, usually something
like a fridge/freezer or the central heating which generates nice
spikes when it switches on and off.
--
Peter Parry.
http://www.wpp.ltd.uk/