Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of mattress maker Tempur-Pedic International (NYSE: TPX) plunged 22% on Friday after the company's full-year forecast missed Wall Street's view.

So what: While Tempur-Pedic's first-quarter profit rose 16% on strong sales, a particularly weak outlook for 2012 is triggering concerns over slowing growth. The stock has been on a tear over the past several months on impressive revenue growth, but today's news is forcing Mr. Market to sober up rather quickly.

Now what: Management now sees full-year EPS of $3.80 to $3.95 on revenue of $1.6 billion to $1.65 billion, versus the consensus of $3.97 and $1.66 billion. Longer-term, CEO Mark Savary noted on a conference call with analysts that the company still expects to meet its goal of $2 billion in sales by 2014 and $3 billion by 2016. So for value-vultures with a multiyear time frame, today's big pullback might be a good opportunity to swoop in.

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