Windows 8.1 error after in sleep mode overnight

I put my new Window 8.1 installation in sleep mode at the end of the day.
 When I come back the next morning, I have an error message something like "Boot device error, change your boot device or insert media"?  There isn't any CD or DVD in the disk bay
and the computer has stopped working.
 I have to reboot to begin working again....

Help please!

John

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