Sleeper's headline offer is 15% off your entire purchase, which applies to all orders and makes it the best general discount if you're shopping the full-price selection. However, the brand runs multiple seasonal sales alongside this blanket deal, so your savings may depend on what you're buying and how much you're spending.
Shopping full-price items: The 15% off sitewide deal beats the other standard discounts, delivering solid savings on anything not currently on sale. If you're adding more than one piece to your cart, this applies to the whole order, making it consistently strong for most budgets.
Buying from the Winter Sale: The Winter Sale offers up to 60% off select styles, which will almost certainly save you more than 15% off full price. If you find pieces you love in the Winter Sale section, go directly to those discounted items rather than applying the 15% code to their regular prices.
Buying from the Summer Sale: Similarly, the Summer Sale cuts up to 30% off sale styles. On moderately discounted items, this could match or exceed the 15% full-price discount, so check the final prices carefully before settling on your approach.
Spending over $320: Free domestic and international shipping on orders over US$320 is an additional saving on top of any percentage discount. If you're crossing that threshold, stack this with your chosen percentage offer—the shipping discount applies alongside your discount code at checkout.
Newsletter signup for first-time customers: Signing up to Sleeper's newsletter nets you special offers and promotions, which may include one-off codes or early access to sales. If you're new to the brand and planning multiple purchases, this is worth doing before you shop, as newsletter-only codes can sometimes beat the standing offers listed here.
Only one discount code applies at checkout, so compare what you're buying against each option and choose the one that produces the larger saving. If you're buying full-price items and nothing in the seasonal sales appeals, the 15% discount is your baseline. For sale section shopping, the seasonal discounts usually win. Either way, check your basket total after applying the discount to make sure you're getting the best deal available.