Get some good sleep and save some money with Casper’s 4 Day Sale, now through May 13. For every $1,000 you spend, the sleep retailer will knock off $100, and you can save up to $300 total. And unlike other Casper promotions, you don’t have to buy a mattress to take advantage of it. So, feel free to stock up on new bedding, bed frames, pillows, and other Casper products using promo code SHUTEYE, and have sweet dreams of savings.