When I make my computer to sleep after a few hour it will light up again and say that The mac have a problem need to be shut down

I don't know why wne I put my mac to sleep it will light up it self after a few hour and say that the mac have a problem needs to be shut down, does anyone know why?

Sounds like it's experiencing a kernel panic. Post the latest report. See
About kernel panics,
Technical Note TN2063: Understanding and Debugging Kernel Panics,
Mac OS X Kernel Panic FAQ,
Resolving Kernel Panics, and
Tutorial: Avoiding and eliminating Kernel panics for more details.

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