The second day of Amazon Prime Day is upon us, with sitewide savings for Prime members on popular categories ranging from home goods and pet products to tech and fitness equipment. And with the sale event ending today, these deals won’t be around much longer. Whether you’re planning to invest in your sleep setup (beyond updating your mattress) or add a new step to your skin care routine, Amazon is offering notable discounts on pillows, hair care products, sunscreen and more during the sale. SKIP AHEAD Prime Day beauty and wellness sales on Amazon | Prime Day beauty and wellness sales at other retailers Prime Day’s history traces back to…