Side sleepers benefit from a mattress that provides extra cushioning for relieving hips and shoulders, and Helix Sleep makes some of the best we’ve tried. This weekend the sleep specialist has slashed mattress prices across their site, including 20% off the Helix Midnight Luxe mattress ahead of Black Friday mattress sales next month. Plus, you get free two free pillows worth up to $150 depending on the size of mattress you buy when you buy the Helix Midnight Luxe.