When you get the bluescreen, do you get this information on the blue screen :
and this: "(00000003, parameter2, parameter3, parameter4)" ?
Without dump files your job will be made much harder, because if you can't identify the exact driver that is causing the problem then it probably makes sense to replace/update all of you drivers, one at a time.
See here for instructions: DRIVER_POWER_STATE_FAILURE 0x0000009f - Microsoft Answers
Sometimes when you look at the Properties for your devices in Device Manager you might see a problem device clearly. You also may have clues as to which device from your use of your laptop. And of course, if you've made any system changes or installations around the time the behavior cropped up now would be the time to mention that.