One sleep expert says that one device explains could be more effective than a fan at keeping your bedroom cool during a heatwave – and most British homes may already have one

One sleep expert says that one device explains could be more effective than a fan at keeping your bedroom cool during a heatwave – and most British homes may already have one

If you're struggling to sleep in the heat, there are a couple of things you can do to keep cool at night - and they won't cost you a penny