I've had my phone since Thursday, and I just now experienced this. So this morning when I woke up my phone, I pressed the sleep/wake button. The screen turned on and then turned off. I press the sleep/wake button again and it does the same thing. I finally press it a third time and it goes to the unlock screen... WHAT?
This happened an hour ago, I rebooted and have been trying to replicate this. But haven't been able too... Should I worry?