Why does my computer freeze when I leave it sitting on for more than an hour?

If I leave my computer on for an extended amount of time with it closed, the computer will not light up as I open it up or if I punch the keys.  I can only see the slender light in the front right that has a slow flash.  To turn it on I have to hold the power button until I don't see the flash and then power it back on. Sometimes this does not work and I need to force it off again.  Has anyone had this issue?  Does anyone know what this is?

Back up all data immediately as your boot drive may be failing.
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Triple-click anywhere in the line below on this page to select it:
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