Nectar memory foam mattresses fully expand in 24 to 72 hours. Here is what affects the timeline, how to speed it up, and when to worry.
Unboxing a new Nectar feels a little anticlimactic. You drag a heavy box into the bedroom, slice the plastic, and watch a flat slab of memory foam slowly puff up like a soufflé. So how long until it actually feels like a mattress?
Short answer: a Nectar mattress takes 24 to 72 hours to fully expand. Most beds reach 90% of their final shape within the first 6 to 8 hours, but corners and the center fold are the last to settle.
Below we break down the timeline by mattress size, the five environmental factors that speed it up or slow it down, and what to do if your Nectar still looks pinched after three days.
Nectar's official guidance is 24 to 72 hours for full expansion. In practice, larger sizes and thicker hybrid models lean toward the upper end of that window. Here is what we typically see in our review lab and from reader reports:
You can sleep on the bed before it has fully expanded - Nectar explicitly says this is safe and won't damage the foam. It just won't feel like its final self yet.
Five variables drive the curve from rolled brick to fully sprung mattress. None of them are exotic - they are just memory foam physics.
Memory foam is viscoelastic, which is a fancy way of saying its stiffness depends on temperature. Cold foam is sluggish. Aim for a room temperature between 68 to 72 °F (20 to 22 °C). Below 60 °F, expect expansion to drag past the 72-hour mark.
Foam expands by drawing air back into the cells that were vacuum-collapsed at the factory. A closed, stuffy room slows that process. Open a window or run a ceiling fan on low for the first few hours.
Most sleep guidelines recommend bedroom humidity between 30% and 50%. Very dry air (under 25%) makes foam stiffer; very wet air (over 60%) traps off-gassing odors and slows the smell from clearing. A standard hygrometer is a $15 sanity check.
The Nectar Classic is 12 inches thick; the Premier is 13; the Premier Copper sits at 14. Each extra inch of foam means more compressed material that has to expand. Thicker beds also mean denser inner layers, which rebound more slowly than the comfort layer on top.
Surface area matters. A Cal King has roughly twice the foam volume of a Twin, so a Cal King simply has more material to recover. This is why Nectar's official window is generous - it is sized for the worst-case combo of king + premium + cool room.
Three checks we use in the review lab - and that any owner can do with a tape measure and a hand:
Yes. Nectar is explicit on this point: sleeping on the mattress before it fully expands will not damage the foam, void your warranty, or affect long-term performance. The only trade-off is comfort - the bed will feel firmer than its final medium-firm setting until the foam fully relaxes.
If you have somewhere else to sleep for a night, take it. The 24-hour mark is when most owners say the bed first feels like a mattress instead of a stiff foam slab.
Try these steps in order before contacting Nectar support:
Nectar's CertiPUR-US certified foam off-gases mildly when you first unbox it. The smell is harmless and dissipates within 24 to 72 hours in a ventilated room. To speed it up: open a window, run a fan, and skip the sheets for the first day. If the odor lingers past a week, contact Nectar - that's outside normal range.
Nectar's official storage guidance: unbox within 60 to 90 days of delivery. Past that window, the foam can develop a permanent compression set that prevents full expansion - and it may void your warranty. If you are renovating or moving in stages, store the unopened box flat, indoors, away from temperature extremes.
A Nectar mattress takes 24 to 72 hours to fully expand. Most beds reach about 90% of their final shape within the first 6 to 8 hours, with corners and the center fold settling last. King and California King sizes lean toward the 72-hour end.
Yes. Nectar explicitly states it is safe to sleep on the mattress immediately after unboxing. It will not damage the foam, void the warranty, or affect long-term performance - the bed will simply feel firmer than its final medium-firm setting until expansion completes.
First, warm the room to 68-72 °F and improve airflow. Walk gently across the surface to push out trapped air, then leave the bare mattress uncovered for another 24 hours. If a corner is still more than 1 inch shorter than the others after 96 hours, contact Nectar support - it qualifies as a defect under their Forever Warranty.
The smell is normal off-gassing from CertiPUR-US certified foam, which is non-toxic. It dissipates within 24 to 72 hours in a ventilated room. Open a window, run a fan, and skip sheets for the first day to speed it up.
Nectar recommends unboxing within 60 to 90 days of delivery. Beyond that, prolonged compression risks permanent damage to the foam structure and may void the warranty. Store the unopened box flat, indoors, in a climate-controlled space.
Yes - significantly. Memory foam is viscoelastic, meaning its stiffness changes with temperature. A room at 68-72 °F lets the foam expand at the expected rate; below 60 °F, expansion can drag well past 72 hours. Warming the room is the single most effective fix for slow expansion.
Slightly. Twin and Queen sizes typically expand in 24 to 48 hours, while King and California King sizes lean toward the 48 to 72 hour range simply because there is more compressed foam volume to recover. Premier and Premier Copper models also take longer due to extra thickness.
Compare Nectar Classic, Premier, and Premier Copper side by side - including current pricing, warranty terms, and which model fits your sleep style.
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Banner Mattress EditorialThe Banner Mattress editorial team publishes independent mattress reviews, buying guides, and sleep-health advice. Since 2018 we've tested 1,000+ mattresses and 3,000+ pillows, sheets, and bedding accessories in our review lab - every recommendation is hands-on, never sourced from vendor talking points. Affiliate links may earn us a commission, but never change what we recommend.
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