Endurance problem, seeking answers.

I just bought my ps3 a month ago. I love playing GT5. I am a spec 25 and bspec 34. Here is my problem, I set up an endurance race before going to bed. When I wake up my ps3 is in stand by mode. How do I adjust it so my ps3 will stay on? I lost credit for 2 endurance races this way. Really ticked me off.
Thanks in advance for any solutions to this.
 
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