Sleep Number ComfortNext Lux Smart Bed Delivers Rare High Scores for Side Sleepers
The ComfortNext Lux features a unique internal build and automatic pressure adjustment, though it may lack the rigidity required for those with severe spinal conditions.
A WIRED reviewer, who identifies as a certified sleep science coach and a long-time advocate for firm mattresses to aid spinal alignment, has tested the new Sleep Number ComfortNext Lux smart bed. Contrary to their usual preference for hard surfaces, the reviewer found that the mattress's plush foam layers and unique micro-coil construction provided superior pressure relief. This construction allows for a sinking sensation of three to four inches, which the reviewer notes is prominent due to the thicker top foam layer.
The review highlights that the ComfortNext Lux introduces a micro-coil feature previously unseen in any smart bed tested by the publication. These coils add necessary structure to the multiple foam layers, preventing the mattress from feeling like a marshmallow while maintaining full-body support. This internal build was instrumental in achieving a rare streak of high-quality sleep, with the reviewer recording SleepIQ scores in the high 80s to 90s over six days on a soft setting of 35.
This result stands in stark contrast to the reviewer's six years of testing, during which they have never achieved such high scores on medium-firm or firm mattresses. The bed's "Responsive Air" system contributes to this performance by using sensors to detect high-pressure areas and automatically inflating or deflating specific spots to counteract the pressure. While the reviewer usually skews toward firmer settings for lumbar support, the app recommended a softer setting to improve their sleep metrics.
However, the article notes that the mattress lacks the rigidity required for individuals with severe back pain or scoliosis. Even at the firmest setting of 100, the ComfortNext Lux feels only medium-firm due to its plush nature. The reviewer advises against the bed for those who require a truly firm surface, such as full-time stomach sleepers or heavier-bodied individuals who need significant lift around their midsections.
The review also addresses the compatibility of adjustable bases, noting that the unit was tested with the FlexFit model. While the base provided a solid foundation, the reviewer points out that Sleep Number bases currently lack lumbar support bars. Consequently, pairing the smart bed with a third-party adjustable base is not recommended, as the proprietary bases do not offer the necessary support features found in other designs.
Additional features include automatic, gentle under-bed lighting with three brightness levels that activates when covers are peeled back in the middle of the night. The system also offers zero gravity settings to reduce pressure on the spine, provided an adjustable base is used. Despite the limitations regarding firmness, the reviewer concludes that the bed excels for side sleepers, offering the cushioning often craved for pressure points without feeling claustrophobic.
