Sleep Number Climate360 Smart Bed review 2026: The $10K bed that heats, cools and fights snoring

Of course, Sleep Number’s big claim to fame is its adjustable firmness — an actual “sleep number” with 20 firmness settings between 0 and 100. Air chambers in the bed allow for a nearly unmatched level of personalized comfort and support — and that’s a bigger deal than you might think. “Different sleep positions do better with specific mattress firmness to feel fully supported,” says Karena Wu, a board-certified specialist in orthopedic physical therapy.