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Choose the Prime if you want two firmness choices and unusually strong edges in a budget foam mattress. Compare a cooler or faster-responding design if heat and easy movement matter more.
Sinkage measured 2.03–2.11 inches, and the comfort system measured around 4.0 inches. Pressure relief was good when the selected side matched the sleeper, but the fit table shows clear risk for most side and stomach sleepers above 130 pounds.
Sinkage measured 2.03–2.11 inches, and total height measured around 12 inches. The result is most useful for sleepers whose hips stay level on this flippable foam feel.
Peak-to-peak acceleration measured 11.58–12.06 m/s². The all-foam build and very low bounce help contain smaller movements, although larger position changes remain noticeable.
A fixed 12 lb load creates the impact while an accelerometer records the movement that crosses the mattress.
Sinkage measured 2.03–2.11 inches, creating moderate surface contact. Temperature control was good for an all-foam mattress, but bedding, room temperature, and foam depth can still make it feel warm.
Sitting-edge compression measured 2.69–2.81 inches, and lying-edge support was excellent. That is unusually stable for an all-foam mattress and useful for sitting, sharing a smaller size, or sleeping close to the perimeter.
We measure seated compression, then check how secure the surface remains while lying directly along the edge.
The surface mostly recovered in 0.69–0.71 seconds and fully recovered in 2.16–2.24 seconds, while bounce measured a very low 5.81–6.05 inches. Movement remains manageable but distinctly slower than on a responsive hybrid or latex mattress.
The mattress measured around 12 inches tall with a four-inch comfort system. Those are strong construction signals for a budget all-foam mattress, while storage history and present condition are the main durability variables.
Confirm the written purchase protections attached to the specific listing before buying.
Reddit product discussionsThe cited Prime discussions include owners who liked the flippable firmness options. One broader SweetNight discussion raises material-transparency questions; it informs seller and product-context caution rather than Prime performance.
SweetNight's policy pages document the 100-day trial, return requirements, channel caveats, and 10-year warranty. Comfort conclusions come from testing and owner feedback.
The cited Prime discussions include owners who liked the flippable firmness options. One broader SweetNight discussion raises material-transparency questions; it informs seller and product-context caution rather than Prime performance.
Thread asks about SweetNight Prime; one owner liked the four-firmness design, while another commenter raised SweetNight materials-transparency concerns.
Owner upgraded to SweetNight Prime and liked the rotating four-firmness design.
Brief recommendation in a spouse split-firmness thread; not an owner report.
SweetNight's policy pages document the 100-day trial, return requirements, channel caveats, and 10-year warranty. Comfort conclusions come from testing and owner feedback.
Provides product identity and policy context for SweetNight Prime.
Documents current SweetNight catalog context.
Listed the trial and warranty context during the June 20 policy check.
Model checkedJul 9, 2026Discontinued
Configuration reviewedSweetNight Prime · Medium flippable memory foam · 12-inch measured profile
The latest model check found that the brand no longer sells this model new.
Comfort systemMemory-foam mattress · Top
4.0″The tested mattress had approximately 4 inches of comfort material above its support core. Memory foam conforms under sustained load, spreading pressure over a larger contact area. Its thickness and position influence contour depth and how quickly the sleeper reaches firmer layers below.
Why it matters: Across the SweetNight Prime Memory Foam Mattress, testing found good but position-dependent pressure relief. This is one of the layers most responsible for shoulder and hip cushioning; sleepers who dislike a close contour should compare it with the mattress’s recorded sinkage and recovery.
Support coreFoam support core · Core
The mattress measures approximately 12 inches tall, with layered foam providing contouring, motion control, and primary support. This foundation resists deep compression and keeps the comfort layers working on a stable plane; it is not intended to provide the mattress’s initial plushness.
Why it matters: For the SweetNight Prime Memory Foam Mattress as a whole, the four-inch comfort system is substantial for a budget foam mattress. Its thickness and material quality are more relevant to long-term shape retention and bottoming-out resistance than to surface softness.
Cover and surface feelBrand-listed cover materials · Top
A soft fabric cover completes the flippable all-foam design. As the surface textile, it chiefly affects the initial hand feel, moisture movement, and how readily heat leaves the sleeper; it supplies little of the mattress's deep support.
Why it matters: In the finished SweetNight Prime Memory Foam Mattress, testing found good temperature control for an all-foam mattress. Treat the cover as one part of thermal comfort rather than proof that the mattress will stay cool for every sleeper.
Choose if: You want a SweetNight foam mattress with stronger cooling.
Watch out: Do not assume the feel, construction, price, or policies are the same as this reviewed mattress.
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