02D24E7D-67D3-4337-92AC-2BC3D8171DB7 Yes A72A1DAE-6539-461D-A000-4179652AA390
EXTENDED Presidents' Day Sale: $1,350 in savings
0 1
Copy Discount Code

Code copied successfully.

Blog Lux Comfort

How Long Does It Take a Memory Foam Mattress to Expand?

From the Puffy Editorial Team | 4 min read.
How Long Does It Take a Memory Foam Mattress to Expand?

Congratulations! You've just received your new memory foam mattress. It's rolled up tight, vacuum-sealed, and eagerly awaiting its full, plush expansion. But patience is key. Before you jump into bed, it's crucial to understand the intricacies of memory foam expansion.

Table of Contents

The Standard Expansion Time for Memory Foam Mattresses

Most manufacturers recommend allowing memory foam mattresses to expand for 24 to 72 hours. This gives the foam ample time to return to its original shape, ensuring optimal comfort and longevity. However, factors like the specific brand, the density of the foam, and the ambient room temperature can all influence expansion times.

How to Get a Memory Foam Mattress to Expand

The memory foam expansion process is relatively straightforward:

  • Unbox Promptly: Once received, unbox your mattress immediately. The longer it remains in its compressed state, the longer it might take to fully expand.
  • Spread Out in a Ventilated Area: Lay your mattress on a flat, solid surface in a well-ventilated room. This helps the foam breathe and expand.
  • Wait: Patience is indeed a virtue here. Avoid jumping or placing heavy objects on the mattress. Let nature take its course.

How to Make a Memory Foam Mattress Expand Faster

If you're in a hurry, consider these strategies:

  • Warm it Up: Memory foam responds well to heat. Increase room temperature or use a blow dryer on a cool setting to encourage the foam to expand. But always be cautious; overheating can damage the foam.
  • Gentle Massage: Applying gentle pressure and massaging the mattress can stimulate the foam cells, encouraging them to expand.
  • Ventilation: Fresh air can be a booster. Open windows and turn on fans to speed up the off-gassing and expansion process.

What Happens If You Sleep on a Memory Foam Mattress Before 24 Hours?

While the temptation might be strong, it's recommended to resist. Sleeping on the mattress too soon can:

  • Prevent Full Expansion: Your body weight can impede the expansion process, preventing the foam from reaching its full potential in thickness and comfort.
  • Off-gassing: Memory foam mattresses release a distinct smell known as off-gassing when new. This odor is the result of the manufacturing and packaging process. Sleeping on it too soon can be unpleasant and may expose you to the full force of this scent.

What Happens If You Sleep on a Memory Foam Mattress Before 48 Hours?

The potential consequences of sleeping on your mattress within 48 hours are similar to the 24-hour mark, but with reduced risks:

  • Reduced Expansion Issues: Most of the mattress would have expanded by now, but there's still a risk of unevenness if slept on too soon.
  • Lesser Off-gassing: While the smell would have reduced considerably by the 48-hour mark, it's still present. For those sensitive to smells, it might still be bothersome.

Check out Puffy mattress reviews from real customers and see how we compare with other brands.

Factors Affecting Memory Foam Mattress Expansion

Several elements can influence how long it takes for your mattress to expand fully:

  • Foam Density: High-density foams generally take longer to expand compared to low-density foams.
  • Temperature: Cold environments can stiffen the foam, causing it to expand more slowly, while warmer settings facilitate faster expansion.
  • Humidity: High humidity can slow down the expansion process.
  • Mattress Thickness: Thicker mattresses, with multiple layers of foam, might require a longer expansion time.

Use our store locator to find the closest furniture or mattress store near you and feel the cloudlike comfort of our Puffy Mattress in person.


Understanding the expansion process is essential to ensure that your memory foam mattress serves you well for years to come. By allowing it ample time to breathe and expand, you're setting yourself up for countless nights of peaceful sleep. Always refer to the manufacturer’s instructions and when in doubt, remember: patience pays off, especially in the world of memory foam.

Choose Your Puffy Mattress

Shop the best-rated Puffy mattress with these extra comfy benefits:

  • $1,350 In Savings
  • Lifetime Warranty
  • 101-Night Sleep Trial
  • Free, Contactless Delivery
  • 100% Made in the USA
Shop Now