I wasn't sure if my iMac was ever really going to sleep on its own, or if it was only the monitor that was turning off. So last night before bed, I decided to put it to sleep from the Apple menu. It clearly went to sleep doing it this way. But waking up the computer was different this morning. Instead of simply hitting a key on the keyboard, I had to press the power button in back (and it came right back on). Is this the normal way to wake up an iMac (i.e., the power button)? Thanks!