You may think you'll have to spend a small fortune on a new mattress, but we bed to differ! Get a single Sovereign 4600 series pocket sprung mattress for £209, a double for £299, or a king size or super king size for £399, saving you up to 76% off Sleep Express' prices (correct as of 21.5.16). Sweet dreams are made of these, who are we to disagree? Thanks to today's deal, you've got the chance to get cosy with a fabulous 4600 series pocket sprung mattress. Made with layers of the finest natural materials, including cashmere, lambs' wool and silk, these mattresses offer superior comfort. Keeping you warm in the winter and cool in the summer, we know you're sure to get a good night's sleep!