The short answer
Buy the DreamCloud ifeither sleeper is over about 230 lb, you want the strongest lumbar support in this comparison, or the ability to return the bed after months rather than weeks is worth real money to you. A 365-night trial is the single most valuable spec on this page for anyone who has already bought the wrong mattress once.
Buy the Sweetnight CoolNest ifyou sleep on your side, or you share a bed with someone who wants it softer than you do. Its pillow-top gives the shoulder and hip somewhere to sink while the coils underneath keep the lumbar spine level — that combination is the classic compromise bed, and it costs meaningfully less.
Support and firmness
The DreamCloud is listed as medium-firm, around 6.5 out of 10 on our read of its description; the Sweetnight sits a step softer at a medium, around 6. Both are inside the band the evidence supports — a randomized Lancet trial found medium-firm outperformed firm for chronic low-back pain, and a Sleep Healthsystematic review reached the same conclusion for spinal alignment — but they sit at opposite ends of it, and that half-point is what you feel.
The distinction matters most as weight goes up. Every mattress has a load at which its comfort layer stops cushioning and starts simply compressing, and a pillow-top reaches that point sooner than a firmer quilted surface. For two average-sized sleepers, both beds hold the line. For a heavier sleeper, or two, the DreamCloud has more in reserve, which is why our heavier-bodies roundup leads with it and the back and hip pain page leads with the Sweetnight instead.
The pillow-top question
The Sweetnight's pillow-top is genuinely its best feature and its main long-term watch item, and it would be dishonest to present only the first half. A quilted pillow-top layer is what lets a coil bed feel soft at the surface without going soft underneath, and for a side sleeper with back pain that is close to the ideal arrangement: pressure relief at the shoulder, support at the lumbar spine.
The trade-off is that pillow-tops compress with use, and unlike a support-core failure it happens gradually and unevenly — typically forming a shallow body impression where you sleep. That is not the same as a sag, and it does not usually take the lumbar support with it, but it does mean the bed you buy in year one is a slightly different bed in year five. Our guide to when a mattress is finished covers how to tell a settled comfort layer from a failed core.
The trial is the real difference
This is the spec we would weight most heavily, and it is the one buyers consistently underrate. The DreamCloud listing states a 365-night trial. The Sweetnight listing states no trial at all, which we mark “not published” rather than assuming a short one.
Why it matters more for back pain than for anything else: a new mattress routinely feels wrong for two to four weeks while your body adapts to a different support profile, and it can genuinely ache in the first fortnight even when it is the right bed. That means the window in which you can confidently judge a mattress for a bad back opens at roughly the point a 30-day return window closes. A year-long trial removes that problem entirely. Our break-in guide covers how to tell adjustment from a genuine mismatch.
Certifications, and what neither one says
Both listings name CertiPUR-US certified foam, which tests flexible polyurethane foam for restricted substances, low VOC emissions and restricted flame retardants. Neither listing states a fiberglass position.
That gap is worth naming plainly, because CertiPUR-US is regularly read as covering it and does not: the certification is about the foam's chemistry, and a fiberglass fire barrier is a separate component wrapped around or under it. An unstated fiberglass position is not evidence of fiberglass — it is simply an unanswered question, and we would rather you knew it was unanswered. If that spec is your deciding factor, neither bed here is your answer; the fiberglass-free list shows the beds whose listings do state it, and the certification decoder explains each badge's real scope.
Heat, motion and edges
Both are coil beds, so both breathe far better than an all-foam mattress, and both add a cooling treatment to the comfort layer — gel foam on the DreamCloud, a cooling pillow-top construction on the Sweetnight. Neither has a meaningful advantage we can substantiate from the published specs, and we are not going to invent one.
On motion transfer, both use individually wrapped coils, which is the construction that limits it. Neither will match an all-foam bed for quietness — if a restless partner is your primary complaint rather than your back, an all-foam mattress is a better fit than either of these, and the Zinus foam-versus-hybrid comparison covers that trade-off at a lower price.
On edges, the DreamCloud's firmer build gives a more sittable perimeter, which matters for anyone who has to lever themselves out of bed carefully in the morning.
If the gap is too wide
There is a real middle here, and it is worth saying so. If the DreamCloud is out of reach and the Sweetnight feels too soft for your back, the budget coil hybrids — the Zinus Foam and Spring Hybrid and the Novilla Smarts Coil hybrid— hit a firmer medium-firm for considerably less, at the cost of comfort-layer depth and any published trial. Our budget roundup lays that tier out in full.
