Those holding Sleep Number Corporation (NASDAQ:SNBR) shares would be relieved that the share price has rebounded 28% in the last thirty days, but it needs to keep going to repair the recent damage it has caused to investor portfolios. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 49% over that time.

In spite of the firm bounce in price, it's still not a stretch to say that Sleep Number's price-to-sales (or "P/S") ratio of 0.2x right now seems quite "middle-of-the-road" compared to the Specialty Retail industry in the United States, where the median P/S ratio is around 0.4x. Although, it's not wise to simply ignore the P/S without explanation as investors may be disregarding a distinct opportunity or a costly mistake.

How Has Sleep Number Performed Recently?

While the industry has experienced revenue growth lately, Sleep Number's revenue has gone into reverse gear, which is not great. Perhaps the market is expecting its poor revenue performance to improve, keeping the P/S from dropping. If not, then existing shareholders may be a little nervous about the viability of the share price.

What Are Revenue Growth Metrics Telling Us About The P/S?

In order to justify its P/S ratio, Sleep Number would need to produce growth that's similar to the industry.

In reviewing the last year of financials, we were disheartened to see the company's revenues fell to the tune of 12%. This means it has also seen a slide in revenue over the longer-term as revenue is down 17% in total over the last three years. Accordingly, shareholders would have felt downbeat about the medium-term rates of revenue growth.

Turning to the outlook, the next three years should generate growth of 2.2% per year as estimated by the five analysts watching the company. With the industry predicted to deliver 5.5% growth each year, the company is positioned for a weaker revenue result.

With this information, we find it interesting that Sleep Number is trading at a fairly similar P/S compared to the industry. Apparently many investors in the company are less bearish than analysts indicate and aren't willing to let go of their stock right now. These shareholders may be setting themselves up for future disappointment if the P/S falls to levels more in line with the growth outlook.

The Bottom Line On Sleep Number's P/S

Sleep Number's stock has a lot of momentum behind it lately, which has brought its P/S level with the rest of the industry. While the price-to-sales ratio shouldn't be the defining factor in whether you buy a stock or not, it's quite a capable barometer of revenue expectations.

Given that Sleep Number's revenue growth projections are relatively subdued in comparison to the wider industry, it comes as a surprise to see it trading at its current P/S ratio. When we see companies with a relatively weaker revenue outlook compared to the industry, we suspect the share price is at risk of declining, sending the moderate P/S lower. A positive change is needed in order to justify the current price-to-sales ratio.

Before you settle on your opinion, we've discovered 3 warning signs for Sleep Number (2 make us uncomfortable!) that you should be aware of.

Of course, profitable companies with a history of great earnings growth are generally safer bets. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.