Mattress Firm's headline offer during the Night Owl Sale is a code that gives you 20% off orders over $699. This deal works best for shoppers buying a full mattress or a substantial bundle of sleep products, as it delivers deep percentage savings on larger purchases.
For budgets under $299: If you're just picking up pillows or small accessories, check whether the clearance sale or up to 60% off selected products have the items you want, as these need no code and apply automatically at checkout. If you're spending between $200 and $299 and want a mattress, the up to 60% off selected products sale may be your best bet.
For purchases between $299 and $499: The free adjustable base code works well here if you're buying a mattress or foundation at this price point. However, compare it carefully against the Labor Day sales, which offer up to $700 off mattresses or up to $1400 off split king sleep systems on qualifying items—these can easily save you more. You might also qualify for the free queen adjustable base when you spend over $499 if that deal is still active.
For orders from $499 to $699: The 15% off code becomes available at this spend level and will save you $75 to $105 depending on your exact basket total. That said, the Labor Day sales offering up to $700 off or the free queen adjustable base for orders over $499 should beat this percentage-based discount on most mattress purchases, so compare both options before checking out.
For baskets over $699: Use the 20% off code featured at the top of this page for maximum savings on larger orders. At a $1000 purchase, this will save you $200. Only switch to a different offer if you're buying one of the specific Sleepy's bundles (the $150 off deluxe set, $100 off signature set, or $50 off basic set), since those have fixed discounts that might work better for smaller bundle orders.
If you're buying a complete bundle: The three Sleepy's bundle codes offer fixed savings when you buy the exact combinations of pillows, sheets, and protectors specified. These work well for smaller coordinated purchases where the fixed discount beats the percentage deals.
If you're buying a split king sleep system during Labor Day: The up to $1400 off deal is exclusive to this product type and will typically save you more than any percentage or code-based offer.
At checkout, only one offer applies, so add your items to your basket, note the total, and compare which code or sale produces the largest discount. The percentage-based codes work best on high value orders, while the fixed dollar discounts and Labor Day sales often win on standard mattress purchases.