Double press power key on 8700?

Was recently given a new Blackberry 8700 (my 1st BB) and have a question about screen brightness control. I have auto brightness turned off to get maximum screen brightness manually, so far so good. Then I noticed after putting the phone in sleep mode when I pressed the power key once to turn the phone back on, if I quickly pressed a second time the screen got even brighter. Is this double press of the power button to get the brightest screen normal behavior? Nothing in the user guide about it. Not a big problem I was just wondering.

when the screen comes back on its just adjusting itself I think