By Zahna Eklund & Danielle Kate Wroe A hot water bottle could be your saviour in the hot weather this weekend. The UK is facing its first heatwave of 2024, and many of us will have woken up this morning in a pool of our own sweat as the clammy night air took hold. But according to sleep experts, there is actually a bizarre item that could help you sleep better during a heatwave – a hot water bottle. Traditionally used to keep us warm in the winter, the humble hot water bottle could be a lifesaver in the summer months too, and all you need to do is make one simple change. Swap out the hot water…