How it feels
Medium, and genuinely medium — 5.5 on our gauge, which is rarer than the category's marketing would suggest. The memory foam comfort layer yields for the first inch and a half, then the coil unit takes over. The result is that you sink into the surface without sinking into the bed, which is the single hardest thing to get right in a mattress.
The pillow top on the Luxe version is quilted rather than glued, and it adds about a quarter-inch of cushioning that the standard Midnight does not have. Our testers preferred it unanimously.
Pressure relief
This is the category the Midnight Luxe wins outright. On our 1,024-sensor pressure mat, peak shoulder pressure lying on the side was 38% below the average of the seven mattresses in that round. The heavier the tester, the wider the gap.
Two of our three testers stopped reporting the morning shoulder ache they had logged on the previous three mattresses within four nights. The third, our 240 lb tester, saw improvement but still preferred a firmer surface overall.
The zoned lumbar layer, and whether it is real
Plenty of brands print "zoned" on the box and change nothing. This one is real, and you can verify it yourself: press firmly with a flat palm at shoulder height and again at hip height and the difference is obvious through the cover.
The mechanism is coil gauge. The centre third uses a heavier steel than the head and foot sections, so the pelvis meets more resistance than the shoulders do. That is what allows a medium mattress to keep spinal alignment inside three degrees of neutral for a side sleeper — a soft flat-firmness mattress cannot do both.
We measured the standard (non-Luxe) Midnight in the same round for comparison. Without the zoning it scored a full point lower on spinal alignment for our two heavier testers. The upgrade is worth its roughly $600.
Temperature
+3.1°F across eight hours: mid-pack. Better than any all-foam mattress we have tested, about 1.3°F warmer than the Saatva Classic. Memory foam holds heat, and a coil unit underneath mitigates it rather than solving it.
The cover is a breathable knit with a phase-change treatment, and in a controlled swap it accounted for roughly 0.8°F of the result. Most sleepers will be comfortable. Committed hot sleepers should read the the best cooling mattresses guide and buy a coil-on-coil build instead.
Sharing the bed
Better than any innerspring we have measured, and it is the reason this is our overall pick for couples. The memory foam layer absorbs most of the drop-test energy before it reaches the coils, and our accelerometer reading at the far edge was a third of the Saatva Classic's.
Edge support is adequate rather than good: 1.4 inches of compression at ten minutes seated. You will notice the perimeter give slightly, but you will not feel like you are rolling off.
Who should buy the Sunset Luxe instead
Helix's range is organised by sleeping position, and the Midnight is the middle of it. If you sleep strictly on your side and weigh under about 150 lb, the softer Sunset Luxe relieved more pressure for our lightest tester than anything else we have measured.
Above about 200 lb and sleeping on your stomach, go the other way — the WinkBeds Luxury Firm or the Saatva Classic in Firm.
Warranty and value
Fifteen years, limited, with a 1-inch sag threshold. That is shorter than the lifetime warranties DreamCloud and WinkBeds offer, though over the realistic twelve-year life of this construction the practical difference is smaller than it looks.
Helix discounts constantly. The $1,899 Queen price we paid was itself a discounted figure, and we have not seen the list price charged in eighteen months of tracking. Treat any "sale" here as the normal price.