Quick Answer: Every mattress gets softer over time. During the first 30 to 60 days, this is normal break-in and actually improves comfort. After year 5, softening starts to affect support, and by year 8 to 10, most mattresses have lost enough firmness to compromise spinal alignment. The key is knowing the difference between a mattress that is settling in and one that is wearing out.
In This Guide
Reading Time: 10 minutes
The Break-In Period (Normal)
A new mattress feels different from the one you tested in the showroom. This is not a defect. Every mattress has a break-in period where the materials soften from their factory-fresh state to their intended comfort level.
During manufacturing, foam layers are compressed for shipping, coils are under tension from packaging, and the materials have never experienced body heat or weight. When you start sleeping on the mattress, the top comfort layers begin to conform to your body shape and the materials relax to their designed performance range.
| Material | Break-In Period | Expected Softening |
|---|---|---|
| Memory foam | 30 to 60 days | 15 to 20% softer |
| Polyurethane foam | 14 to 30 days | 10 to 15% softer |
| Natural latex | 7 to 14 days | 5 to 10% softer |
| Pocketed coils | 14 to 30 days | 5 to 10% softer |
| Hybrid (foam + coils) | 21 to 45 days | 10 to 15% softer |
Memory foam takes the longest because it responds to body heat. Each night, your body temperature softens the foam in your sleeping area. Over 30 to 60 nights, the foam reaches its target responsiveness. This is why a memory foam mattress that felt firm on night one feels noticeably softer by week four.
Brad, Owner, 40+ years of experience: "When customers call after two weeks saying the mattress is too firm, I always ask them to give it the full 30 days. Nine out of ten times, by day 30 they call back and say it is exactly what they wanted. The break-in period is real, and it is the number one reason people think they made the wrong choice when they actually made the right one."
8 min read
How Each Material Changes
Foam (Memory Foam and Polyurethane)
Foam is made of millions of tiny air cells. When you lie on it, these cells compress. Over time, the cell walls weaken and the cells compress more easily with less pressure. This is what makes foam softer.
Higher-density foam (1.8 lb/ft3 and above for polyurethane, 4.0 lb/ft3 and above for memory foam) loses firmness more slowly because the cell structure is stronger. Lower-density foam softens faster and may develop permanent body impressions within a few years.
Temperature also matters. Memory foam in a warm bedroom softens more than the same foam in a cold bedroom. In a Canadian home where bedroom temperatures swing from 16 degrees Celsius in winter (with the thermostat turned down) to 24 degrees in summer, the same mattress can feel noticeably different between seasons.
Coils (Innerspring and Pocketed Coils)
Steel coils lose tension gradually. The metal fatigues with each compression cycle (each time you lie down and get up, plus every time you shift positions during the night). A Restonic ComfortCare with 1,222 pocketed coils distributes the load across more springs than a mattress with 800 coils, which means each coil does less work and lasts longer.
Pocketed coils degrade more evenly than connected Bonnell coils because each coil operates independently. Bonnell systems can develop weak spots where the heaviest body parts rest while remaining firm elsewhere, creating an uneven sleep surface.
Latex
Natural latex is the most durable mattress material. It softens the least over time and maintains consistent support for 10 to 15 years. Synthetic latex (SBR) is less durable and can develop surface crumbling after 5 to 7 years.
Our Restonic Revive Tiffany Rose ($1,995) uses Talalay copper latex, which combines the durability of latex with antimicrobial properties from the copper infusion.
Flippable Mattresses
A flippable mattress has comfort layers on both sides. When one side softens, you flip it and use the other. This effectively doubles the comfort layer lifespan. Our Sleep In flippable mattresses are popular in Brantford precisely because they address this softening issue by design.
Year-by-Year: What to Expect
Mattress Firmness Timeline
- Month 1 to 2: Break-in period. Mattress softens 10 to 20% from factory firmness. This is normal and desirable.
- Year 1 to 3: Mattress stabilizes at its intended firmness. Minimal change if the mattress is quality construction. This is the comfort sweet spot.
- Year 3 to 5: Gradual softening begins. Comfort layers start losing resilience. You may notice the mattress does not "push back" the way it used to.
- Year 5 to 7: Noticeable softening. Body impressions may appear (normal up to 1 inch). You may start to feel the support layer through the thinning comfort layer.
- Year 7 to 10: Significant softening. Most mattresses have lost enough structure that spinal alignment is compromised. New aches upon waking are common.
- Year 10+: The mattress is past its useful life for quality sleep. Even if it looks fine, the internal support has degraded.
This timeline varies by material quality, sleeper weight, and maintenance. A 130-pound person sleeping on a high-density foam mattress may get 12 good years. A 250-pound person on a budget foam mattress may see significant degradation by year 4.
Normal Softening vs Problem Softening
The difference is subtle but important.
| Normal | Problem |
|---|---|
| Mattress feels slightly softer overall | Mattress sags only where you sleep |
| You can feel the softening but sleep comfortably | You roll toward the centre or edge |
| Body impressions are shallow (under 1 inch) | Body impressions are deep (over 1.5 inches) |
| The mattress recovers when you get up | The impression stays after you get up |
| Softening is even across the surface | Some areas are soft while edges remain firm |
| You sleep the same number of hours | You wake up stiff or sore |
The Body Impression Rule: Most mattress warranties cover body impressions deeper than 1.5 inches (measured without anyone on the mattress). An impression of 0.5 to 1 inch is normal wear. Between 1 and 1.5 inches is a grey area. Over 1.5 inches indicates the support system has failed. If you suspect a warranty issue, measure the impression by placing a straight edge (like a yardstick) across the mattress and measuring the gap at the deepest point.
How to Slow the Process
You cannot stop firmness changes entirely, but you can slow them significantly.
Rotate Regularly
Rotate your mattress 180 degrees (head to foot) every 3 to 6 months. This distributes wear across the entire surface instead of concentrating it in your primary sleeping area. If you have a flippable mattress, flip and rotate on alternating cycles.
Use a Mattress Protector
Moisture accelerates foam degradation. Sweat seeping into foam breaks down the cell structure faster. A waterproof mattress protector keeps moisture out and extends the life of the comfort layers.
Proper Support Underneath
A mattress on a foundation with inadequate support softens faster because the unsupported areas flex under load. Ensure your base provides consistent, even support. Slats should be no more than 3 inches apart. Centre support legs should touch the floor.
Temperature Control
Memory foam in particular softens more in warm environments. Keeping your bedroom at 16 to 19 degrees Celsius for sleep (which is also the ideal temperature for sleep quality) helps maintain consistent foam performance throughout the year.
When Softening Means Replace
These are the signs that softening has crossed from normal aging into degradation that affects your sleep:
- You wake with pain you did not have a year ago. Gradual onset of morning stiffness, hip pain, or lower back pain is the most reliable indicator.
- You sleep better elsewhere. If you consistently sleep better in a hotel, at a friend's house, or on the sofa, your mattress is the problem.
- Visible sagging. Stand at the foot of the bed and look across the surface. If you can see a valley where you sleep, the support has failed.
- The edge collapses. Sit on the edge of the bed. If you sink dramatically or feel like you might slide off, the perimeter support has worn out.
- It is over 8 years old. Even if none of the above apply, an 8+ year mattress has lost enough internal structure that upgrading will likely improve your sleep.
Dorothy, Sleep Specialist: "People often ask me if they should add a topper instead of buying a new mattress. A topper adds comfort on top of a worn mattress, but it cannot restore the support underneath. If the coils or foam base have degraded, a topper is a bandage, not a fix. It might buy you 6 months of better sleep, but eventually the underlying problem comes through."
Sources
- International Sleep Products Association. "Mattress Lifespan and Replacement Guidelines." BedTimes Magazine, 2024.
- Sleep Foundation. "When to Replace Your Mattress." SleepFoundation.org, 2024.
- Polyurethane Foam Association. "Flexible Polyurethane Foam: Performance and Durability." PFA Technical Bulletin, 2023.
- Consumer Reports. "Mattress Durability and Long-Term Performance Testing." ConsumerReports.org, 2024.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
How long does the mattress break-in period last?
Most mattresses need 30 to 60 nights to fully break in. Memory foam takes the longest, up to 60 days. Innerspring and hybrid mattresses typically break in within 2 to 4 weeks. Natural latex breaks in fastest, often within 1 to 2 weeks. The mattress will soften 10 to 20% during this period, then stabilize.
Is it normal for a mattress to get softer over the years?
Yes, gradual softening is normal for all mattress types. Foam loses density, springs lose tension, and the comfort layers compress. This is expected and usually not a problem for the first 5 to 7 years. After that, softening may begin to affect support, especially if you notice body impressions deeper than 1.5 inches.
Can you make a soft mattress firmer again?
Somewhat. A firm mattress topper can add surface support. Placing plywood between the mattress and foundation adds rigidity underneath. Flipping or rotating the mattress exposes less-worn surfaces. However, none of these restore the original internal support. If the core has degraded, these are temporary measures.
How do I know when softening means I need a new mattress?
Replace your mattress when you see visible sagging deeper than 1.5 inches, when you wake with new aches that improve after getting up, when you sleep better in hotel beds or on the sofa, or when the mattress is over 8 years old and noticeably softer than when new.
Shop This Topic at Mattress Miracle
Here are the firm mattresses we carry at Mattress Miracle:
- Sentora Ultra Firm Mattress
- Spinal Rest Firm Mattress
- Sydney TT Firm Euro Top Mattress
- High Density Firm Mattress
Or firm mattresses in our Brantford showroom.
Related Reading
- Hybrid Mattress Care and Maintenance Canada
- Flippable Mattress Maintenance Guide
- Firm Mattress Care and Maintenance Guide
- How to Clean a Mattress: Complete Guide
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle — 441½ West Street, Brantford, ON — (519) 770-0001
Hours: Monday-Wednesday 10am-6pm, Thursday-Friday 10am-7pm, Saturday 10am-5pm, Sunday 12pm-4pm.
Not sure if your mattress is breaking in or breaking down? Call Talia at (519) 770-0001 and describe what you are feeling. She can help you troubleshoot over the phone or set up a time for you to try comparable mattresses in our showroom so you can feel the difference between a fresh mattress and what you have at home.