Who says you can’t use Mother’s Day sales to treat yourself to something nice, too…like a super luxurious mattress? If anything, your mom would be proud of your smart spending and commitment to better sleep. For the upcoming holiday (which, PSA to all last-minute gift shoppers, is on May 10), Saatva is offering Cosmo readers an exclusive discount on their investment-worthy mattresses. This week, you can take 20% off any mattress purchase over $1,000—just by shopping through the links you find here . Easy, right? Unlock Cosmo’s Exclusive Saatva Discount I cannot recommend the brand’s top-selling Classic Mattress enough, especially when you can save over $400 on the queen-size version. The top innerspring comes in three firmness options, so you can get just the right balance of cushion and support, whether you’re a side-sleeper, sprawler, or toss-and-turner. Then there’s the HD Mattress tailored towards larger bodies, and the Rx Mattress , which provides pressure relief for back, neck, and hip pain.…