Updated
Yes, Sealy requires a break-in period in order to return the mattress for a refund or replacement. Their break-in period is 30 nights, which is one-third of their 90-night trial period.
Most online mattress retailers have similar policies. In general, it takes between 30 and 60 days to break in a new mattress.
Derek Hales is the Founder and Editor-in-Chief of NapLab. His insights and work has been featured on ABC's Tamron Hall Show, Freakonomics, CBS News, ESPN, Reader's Digest, Homes & Gardens, New York Post, CNET, & More. Derek has personally tested 470+ mattresses and began testing mattresses in 2014.
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