Buying a new mattress online is convenient, but you may wonder what happens after it arrives. If your mattress is delivered rolled and compressed in a box, it is normal for it to look smaller than expected when first unpacked.
So, how long does a mattress take to expand after unboxing? Here is what you need to know.
How Long Does a Rolled Mattress Take to Expand?
Most rolled and compressed mattresses begin expanding shortly after they are removed from their packaging. However, the full expansion process can take around 24 to 72 hours, depending on the mattress materials and construction.
During this time, you may notice that the mattress gradually becomes thicker and takes its intended shape. Small temporary creases or uneven areas can also appear while the mattress is expanding.
What Should You Do After Unboxing?
Once your mattress arrives, carefully remove the outer packaging and place the mattress flat on a suitable bed base.
Allow the mattress to expand naturally and avoid placing heavy objects on it while it is still expanding. Make sure the room is well ventilated, particularly if the mattress has been tightly compressed and packaged.
It is also a good idea to check the mattress after unpacking to make sure it has expanded evenly.
Can You Sleep on a New Mattress Straight Away?
Yes. If the mattress has been unpacked and is already taking shape, you can generally sleep on it straight away.
Sleeping on the mattress does not prevent it from expanding. In fact, your body weight and normal movement can help the mattress gradually recover from compression and return to its full shape.
Your mattress may continue expanding over the next 24 to 72 hours, depending on its materials and how long it was compressed. There is no need to wait several days before using it if the mattress is ready to sleep on.
For the best results, simply place the mattress on a suitable bed base, remove all packaging and allow it to continue expanding naturally while you use it.
Why Are Mattresses Compressed?
Mattresses that are rolled and compressed are easier to package, transport and deliver directly to your home.
For customers, this can make mattress delivery more convenient, particularly when ordering online. Once unpacked, the mattress gradually returns to its original shape.
At iSleep, many of our mattresses are delivered rolled and compressed, making them easier to handle when they arrive at your home.
Tips for Setting Up Your New Mattress
For the best experience, keep these simple tips in mind:
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Place the mattress on a suitable bed base.
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Remove the packaging carefully without damaging the mattress.
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Allow the mattress to expand fully.
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Keep the room ventilated during the initial setup.
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Check that the mattress is evenly expanded before making the bed.
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Follow the specific care and setup instructions supplied with your mattress.
Find Your New Mattress at iSleep
Whether you prefer a medium-firm hybrid mattress, a pocket spring design or a memory foam mattress, choosing the right mattress can make a big difference to your everyday comfort.
The iSleep ONE Hybrid combines supportive springs with comfortable layers, offering a medium-firm feel and a balanced combination of comfort and support. It is also one of our popular choices for customers looking for an all-round mattress.
With free delivery, a 200-night trial and a 10-year warranty, iSleep makes it easier to try a new mattress at home.
Final Thoughts
A compressed mattress may look different when you first remove it from the packaging, but this is completely normal. Give it time to expand, place it on a suitable base and allow the mattress to settle before making your bed.
If you are looking for a new mattress in Ireland, explore the iSleep range and find the comfort level that suits your sleeping style.

