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Sleep Science Mattress Review By TrueReviewer

The Sleep Science mattress is an affordable product sold via many online retailers, including Costco. It’s firm and reasonably well made for the price, so it falls under a low-cost mattress that offers good value for money category.

Sleep Science Pros

  • The  mattress is incredibly affordable.
  • The manufacturers (South Bay International) offer very good customer service, so if you have any issues with the mattress you can be confident that they will be resolved promptly.
  • The returns policy offered by Costco gives you peace of mind.
  • The mattress is nice and firm.

Sleep Science Cons

  • Some people find that the mattress is too firm for their taste.
  • It is not ideal for you if you like to sleep on your side.
  • The foam tends to trap heat, which can make it uncomfortable in warm climates.
  • The build quality is decent, but the mattress does not feel as durable as more expensive models.
  • Delivery can take a while on some of the less popular sizes.

sleep science mattress review

Overall Opinion On Sleep Science Mattresses

Sleep Science mattresses are made by South Bay International, and are offered at a highly affordable price point. There are several different models available, with between 3 and 6.6 inches of memory foam, layered iover 3-9 inches of support foam. The foam has densities of 3, 5 or 7 lbs/ft depending on the model that you buy. The foam is more dense than you might be used to if you typically buy high end mattresses, but the density of foam really is something that comes down to personal preference.

Most people who have purchased a Sleep Science mattress report being happy with it. This is a mattress that would be great for a child’s bed, or for a guest room where it will see occasional adult use. Adults who are used to pocket sprung mattresses may feel that the memory foam isn’t ideal for them, but this is a subjective matter.

In terms of durability, this mattress is adequate – 12 percent of people who own a this mattress report that they experience some sagging or softening within three years of purchase. However, given that the mattress is so affordable, this could be a risk that people are willing to take. When new, the mattresses are medium-firm, but they soften over time.

The memory foam conforms to your body, and this offers good support. If you are accustomed to firmer mattresses then you might find that it takes a while to get used to the support. However, this can be a good thing. Around 20 percent of users find that when they sleep on a firm mattress they experience less back pain. There is a small number of people that experience more pain because of the firmness – so it may be worth trying to test the mattress before you buy, if you can find a local stockist.

folding mattress foundation sleep science

When it comes to general comfort and ease of movement, the performance depends on the thickness of the mattress and the density of the foam. The thicker mattresses tend to provide good support except at the edges, and high density foam conforms well to the user’s body but can offer some resistance when you’re trying to roll around or change positions. The lower density models offer less resistance.

These mattresses are great for people who like to sleep on their backs, and can be a bit more problematic for people who sleep on their sides. Stomach sleepers find that the higher density versions are quite comfortable, but the lower density ones might be a little too soft. The nature of the foam means that if one person using the bed rolls around, the other person on the bed should not be disturbed.

When new, the mattress does give off some odor, but this does not tend to last for long. The foam can be a heat trap, and this can be frustrating issue in the summer, or for people who put out a lot of body heat. It takes a while to break in the mattress, and the combined issues of odor and firmness can give people some initial buyer’s remorse, although once the mattress is broken in, this is not a problem.

The higher density models are popular with heavier people, but those who are under 120lbs might feel that the mattress is too hard for them.

Because the mattress is made of foam, it is silent in use, and you don’t have to worry about wear and tear revealing springs or metal. However, the foam construction does have downsides. While the lower density versions are quite light, the higher density ones for a double bed can weigh as much as 120lbs – which could be heavier than the person sleeping on it!

Sleep Science mattresses are not intended to be flipped (there are two layers, one firmer than the other), but you can rotate them to help prevent sagging and excessive wear.

firm bed technology by sleep science

Sleep Science Bed Customer Service

The warranty on a Sleep Science Mattress is 20 years, but that warranty is a limited one and it won’t cover general sagging. It will cover clear defects and poor performance, though, and Costco’s own returns policy is generous as well, so you can be confident that if you buy one of these mattresses you will get something well made and fit for purpose.

Delivery times vary, which can be problematic. The more popular models are available on a five day delivery schedule, but some of the others can take up to one month. Since the primary way that these mattresses are sold is online, this is a bit of an issue – if you aren’t sure what density you want, there’s a chance you could buy the one you think you prefer, try it, and change it if you don’t like it, but the wait times and shipping times make this a problematic option.how firm beds are made


Sleep Science memory foam mattresses are not a good option for people who want a comfortable mattress at a budget price. They are clearly a budget mattress maker, and you will find that if you pay significantly more you will get something that will last for longer, but that does not make these a bad choice. If you’re looking for a bed for a child, or you want to replace the mattress in the spare room with something that will hold up well and that most of your guests will like, then this is a great choice. It might not be the best choice for the master bedroom, but it’s still something that you can buy with confidence.

The returns policy is fair, and Costco are a retailer that you can count on, so you won’t have to worry about getting something unsafe or that will fall apart after just a few month’s of use. You should still think carefully before buying and make sure that you get the right size and the right density, because online returns can be a hassle.

You get what you pay for with a bed, and if you have back pain, then a good mattress is a must. See if you can find a local store that will let you try a few different brands for comfort, instead of spending money on something that you have never tested, and that you don’t know much about. Your body will thank you in the long run, and it will be worth it to get something that will not need replacing within a few years of purchase.

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