ragdall, I think you have a point there. I have a body thermostat which functions best in very hot climates. I've zoomed about in West Africa at 40 degrees C, admittedly sweating profusely but happy as a flea. Anything below freezing here in UK and I'm whingeing and whimpering. However as a child, with no central heating at home, I never felt particularly cold. We wore woolly things and knitted jumpers etc. I had thick frost inside my bedroom window each morning. I suspect age has a lot to do with it too!