Methodology

The evidence-tier system

Most writing about chemistry and compliance collapses very different kinds of statements into the same confident voice. We do not. Every claim we publish — in an article, a compound profile in the Atlas, a product score, or a tracked regulation — carries one of five evidence tiers, so the reader always knows exactly how settled a claim is. The same five tiers run through everything on the site, and appear as a label next to the claim.

The regulatory tracker

The Sleep Environment Regulatory Tracker applies the same discipline to law that the rest of the site applies to chemistry. It tracks the rules governing what is allowed in mattresses, bedding, and the bedroom — flame retardants, PFAS, fiberglass, and flammability standards — across US federal, US state, EU, and Canadian jurisdictions. It rests on a handful of non-negotiable principles:

• Primary sources only. Every entry links to the actual law or notice — the agency page, the eCFR section, the legislative database — never a secondary article about it. Each is tagged Regulatory.
• Every entry is dated. A "last-verified" date records the day we last confirmed the rule's status against its source. In a tracker, currency is the product — a stale entry is worse than no entry.
• Status, not spin. Each rule carries a fixed status — Effective, Pending, Proposed, In comment period, Under review, or Repealed — so you can see at a glance whether it binds today or is still being written.
• Plain language, plus what it means. A two-to-three sentence summary in human terms, and a line on how the rule actually applies to the sleep environment — the part a general legal database leaves out.
• Conservative reading. Where a rule's scope is still being defined, we say so rather than overstate it. We never invent a date or a finding; when a detail can't be confirmed, it is left out, not guessed.
• Curation over exhaustiveness. The tracker is deliberately deep in the categories that matter to the sleep environment, not a comprehensive legal database. Depth we can keep current beats breadth we can't.

New entries and status changes flow from the fortnightly Sleep Environment Brief: every regulatory move it covers becomes a new entry or an updated one. The Brief generates the currency; the tracker stores it.

The product score

Alongside the regulations, we score products. Today that means mattresses — the Sleep Environment Score — built on a framework designed to extend to other parts of the sleep environment as we add them. The score is a deterministic, fully-cited function of a product's disclosed construction: the same inputs always produce the same number, every point links back to the Atlas and the primary literature, and the engine runs openly in your browser. A mattress is evaluated across the dimensions below, and cannot receive a composite score until its construction is documented across all of them — where a detail is undisclosed, we say so, and the entry stays in "Partial" status rather than guessing.

Documentation standards

Before any mattress appears in the database with a published score, the following must be in hand:

• Law tag documentation — physical photo or manufacturer-confirmed materials list, itemized by percentage.
• Fire barrier identity — confirmed through law tag, manufacturer disclosure, or independent testing. "The brand said it's safe" is not acceptable documentation.
• 14-day right of response — every brand is contacted before their entry publishes. They are given 14 days to provide corrections or additional documentation. Responses are incorporated. Non-responses are noted.
• Source links — every cited claim links to a primary source: the regulatory filing, the peer-reviewed study, the certification database entry, or the manufacturer's own disclosure page.

What we will not do

• Accept manufacturer claims without documentation. "Our mattress is non-toxic" is a marketing claim, not a finding.
• Treat certification scope as total scope. CertiPUR-US certifies the foam. It does not certify the mattress.
• Assign composite scores before all five dimensions are documented.
• Remove or soften a score because a brand objects to the finding.
• Present a regulation as settled when it is still proposed, or state a legal detail we cannot link to its primary source.
• Accept sponsored content, paid placements, or affiliate commissions from any brand we score.

Corrections and updates

When we are wrong, we update the piece and timestamp the change. The old version is archived and accessible. We do not quietly edit errors out of existence — that's how affiliate-funded publications maintain the appearance of credibility while updating inconvenient findings.

If you find an error in anything we've published, email us at hello@embrsleep.com. We will investigate and respond within 7 days.