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What's the craziest cooling methods at the moment?
I have a hot bath every night, about 42-43 degrees c whatever the weather.
It sounds counterintuitive but a hot bath at the right time triggers your thermoregulatory system and you'll cool rapidly when you get out. It doesn't last long but I've noticed it.
Apart from that, a 2l frozen water bottle in front of a large fan at bedtime and blackout material on all the bedroom windows throughout the day.