Hi there, This issue has sort of just sprang up in the last several weeks, and it's rather annoying. My late 2012 iMac used to wake up immediately, I would put in my password, it would unlock, and things would be peachy. Now, however, it takes a good long while to wake up after pushing buttons on the keyboard (the screen just sits there with the backlight on, but black), and it doesn't let me move the mouse or put in my password for as much as 30-60 seconds after it wakes up. Sometimes, it goes back to sleep again before it lets me input the password, and I have to wake it back up again, though the second time around, it works almost immediately. I have the 1TB fusion drive, the 680MX, the 3.4GHz i7, etc. I know it's not a keyboard and mouse connectivity issue because it begins to wake up right after a push a button on the keyboard. Thanks, and any help would be appreciated.