Mattress Brands: AI Market Discovery Index

Tracking how AI platforms recommend mattress brands. This public AI Market Discovery Index is updated monthly since July 2026.

By Mark Huntley, J.D.Growth Strategist & AI Discovery Analyst

6 minutes read

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On this page

01Benchmark Summary
02Current Benchmark at a Glance
03Research Scope and Qualification
04Current Brand Standings
05How to Read the Standings
06Recommendation Coverage Movement
07Largest Decline: Sleep Foundation
08Significant Decliner: Mattress Clarity
09Category Leader: Sleepopolis
10Recommendation Placement Snapshot
11Buyer-Intent Distribution
12Historical Measurement Record

Benchmark Summary

Sleepopolis led the benchmark in September 2026 with valid recommendation coverage of 3.0%, down from 4.9% in July 2026. The gap to the next brand was 1.0 percentage point, with Sleep Foundation at 2.0% in September 2026, down from 7.9% in July 2026.

No tracked brand posted a significant month-over-month increase in September 2026. Sleep Foundation recorded the largest coverage decline from the prior month, moving from 2.8% in August 2026 to 2.0% in September 2026, a change within normal month-to-month variation. Mattress Clarity also declined from 2.1% in August 2026 to 1.0% in September 2026.

Across the full series, Mattress Clarity and Sleep Foundation were the two significant decliners. Mattress Clarity fell from 4.6% in July 2026 to 1.0% in September 2026, declining in each of the two months since July. Sleep Foundation fell from 7.9% in July 2026 to 2.0% in September 2026, also declining in each of the two months since July.

The benchmark began with 800 prompt-surface observations in each month and produced 302 qualified observations in September 2026 after qualification.

AI recommendation trend

valid recommendation coverage, Jul 2026 to Sep 2026

Sleepopolis3.0%
Sleep Foundation2.0%
Mattress Nerd1.3%
Mattress Clarity1.0%
Mattress Advisory0.0%
Sleep Advisor0.0%

Current Benchmark at a Glance

Measure	Jul 2026	Sep 2026	Movement
Qualified benchmark observations	305	302	Down 3
Tracked brands	6	6	No change
Qualified surface breadth	6	6	No change
Recommendation-shaped answer share	50.8%	45.7%	Down 5.1 points
Valid recommendation shortlist share	73.8%	69.5%	Down 4.3 points
Leader by valid recommendation coverage	Sleep Foundation	Sleepopolis	Changed

August 2026 sat between these two months, with 284 qualified observations and Sleepopolis as coverage leader at 3.5%.

Qualified surface breadth counts the number of canonical AI surface families with at least one qualified observation. The six families measured are ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Mattress Brands

Research Scope and Qualification

The public benchmark is narrower than the raw collection universe by design.

Research stage	Jul 2026	Sep 2026	What it represents
Source prompt-surface observations	800	800	Total prompts collected across AI surfaces
Unique questions	737	751	Distinct questions after deduplication
Brand / competitor mentions	800	800	Prompts mentioning at least one tracked brand
Relevant observations	646	641	Prompts relevant to the mattress brand vertical
Irrelevant observations	154	159	Prompts outside the vertical scope
Qualified benchmark observations	305	302	Public denominator for brand-level metrics

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Brand-level percentages use the qualified observations as the public denominator, not the raw collection. See the AI Market Discovery Methodology.

Current Brand Standings

Brand	Presence rate	Valid recommendation coverage	Top-three rate	Rank-one rate	Net sentiment
Sleepopolis	52.0%	3.0%	1.0%	0.0%	0.4
Sleep Foundation	86.8%	2.0%	1.3%	0.0%	0.4
Mattress Nerd	44.0%	1.3%	0.0%	0.0%	0.5
Mattress Clarity	62.6%	1.0%	0.0%	0.0%	0.4
Sleep Advisor	18.2%	0.0%	0.0%	0.0%	0.2
Mattress Advisory	0.0%	0.0%	0.0%	0.0%	0.0

How to Read the Standings

Presence rate is the share of qualified observations where the brand is mentioned at all.
Valid recommendation coverage is the share of qualified observations where the brand appears in a valid recommendation shortlist.
Top-three rate is the share of qualified observations where the brand appears among the top three recommended options.
Rank-one rate is the share of qualified observations where the brand is the first recommended option.
Net sentiment reflects the balance of positive versus negative mentions, from 0 to 1.

For formulas and denominator rules, see AI Market Discovery Metric Definitions.

Recommendation Coverage Movement

Brand	Jul 2026	Sep 2026	Movement since baseline
Mattress Advisory	0.0%	0.0%	No change
Mattress Clarity	4.6%	1.0%	Down 3.6 points
Mattress Nerd	3.6%	1.3%	Down 2.3 points
Sleep Advisor	0.0%	0.0%	No change
Sleep Foundation	7.9%	2.0%	Down 5.9 points
Sleepopolis	4.9%	3.0%	Down 1.9 points

Largest Decline: Sleep Foundation

Sleep Foundation's valid recommendation coverage fell from 7.9% in July 2026 to 2.8% in August 2026 to 2.0% in September 2026, a cumulative drop of 5.9 percentage points that moved beyond normal month-to-month variation. The brand declined in each of the two months since July 2026. Its presence rate, however, rose from 81.6% in July 2026 to 86.8% in September 2026, and its net sentiment score moved from 0.3 in July 2026 to 0.4 in September 2026, so the brand remained widely present even as its recommendation shortlist share narrowed.

Significant Decliner: Mattress Clarity

Mattress Clarity's valid recommendation coverage fell from 4.6% in July 2026 to 2.1% in August 2026 to 1.0% in September 2026, a cumulative drop of 3.6 percentage points that moved beyond normal month-to-month variation. The brand declined in each of the two months since July 2026. Its top-three rate moved from 2.0% in July 2026 to 0.0% in September 2026, even as presence rate moved from 65.2% to 62.6% over the same period.

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Category Leader: Sleepopolis

Sleepopolis led in valid recommendation coverage in September 2026 at 3.0%, down from 4.9% in July 2026. The lead position shifted from Sleep Foundation in July 2026 to Sleepopolis in August 2026 and held through September 2026. Sleepopolis's presence rate moved from 58.7% in July 2026 to 52.0% in September 2026, and its top-three rate moved from 2.6% to 1.0% over the same period.

Mattress Nerd, Sleep Advisor, Sleepopolis, and Mattress Advisory were classified as stable in September 2026, with movements within normal month-to-month variation. Mattress Advisory held at 0.0% valid recommendation coverage across all three months, with presence dropping from 1.0% in July 2026 to 0.0% in August 2026 and September 2026. Sleep Advisor held at 0.0% in July and September 2026, with a brief 0.7% reading in August 2026.

Recommendation Placement Snapshot

Coverage alone does not show how prominently a brand is recommended. Among the leading brands in September 2026, top-three and rank-one rates diverged from coverage levels.

Brand	Sep 2026 top-three rate	Sep 2026 rank-one rate	Jul 2026 top-three rate	Jul 2026 rank-one rate
Sleepopolis	1.0%	0.0%	2.6%	0.7%
Sleep Foundation	1.3%	0.0%	2.6%	0.0%
Mattress Nerd	0.0%	0.0%	2.9%	2.3%

Sleep Foundation held the highest top-three rate among leaders in September 2026 at 1.3%, while Sleepopolis led in coverage at 3.0% but saw its top-three rate move from 2.6% in July 2026 to 1.0% in September 2026. Mattress Nerd's top-three rate moved from 2.9% in July 2026 to 0.0% in September 2026, and its rank-one rate moved from 2.3% to 0.0% over the same period. Similar coverage levels can still hide different first-position rates.

Buyer-Intent Distribution

All qualified observations in both months fell into the Brand Recommendation class.

Buyer-intent class	Jul 2026	Sep 2026
Brand Recommendation	305	302
Pricing & Value	0	0
Multi-Brand Comparison	0	0
Total qualified observations	305	302

The current public series measures brand-recommendation discovery and does not yet contain qualified observations in the pricing and value or multi-brand comparison classes.

Historical Measurement Record

This is an evergreen benchmark URL. New measurements are added to the same report.

Measurement	Qualified observations	Coverage leader	Leader coverage	Largest coverage movement
Jul 2026	305	Sleep Foundation	7.9%	Sleep Foundation down 5.1 points
Aug 2026	284	Sleepopolis	3.5%	Sleep Foundation down 5.1 points
Sep 2026	302	Sleepopolis	3.0%	Sleep Foundation down 5.9 points

Evidence and Source Layer

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure:

Market share or sales attribution
Every possible AI response to a given query
Organic-search ranking positions
Social media mention volume
Private or sponsored channels
Causality from a metric movement alone

About This Benchmark

The LLM Authority Index AI Market Discovery Index is a neutral, repeatable measurement of how brands appear and are recommended across major AI and search surfaces. It tracks presence, recommendation coverage, placement, and sentiment as distinct signals.

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