I'm curious as to why this would have a heating element and why that would be the default. I thought that a cool/cold bed was better for getting to sleep, sinc

I'm curious as to why this would have a heating element and why that would be the default. I thought that a cool/cold bed was better for getting to sleep, since the body lowers its own temperature at night as part of it's natural circadian rhythm and because cooling helps produce melatonin. And when you are asleep, cooling gives you a deeper sleep and can reduce insomnia. So instead of a £3000 mattress that heats up (and by default does so), you just need a thin duvet (or even just the cover in summer).