Keyboard is still active; how else will you wake it from sleep?
The iMac has no battery, so what do you mean by battery life???
You could always just turn off your keyboard and mouse when you're not using them to save battery life in them.
So every time I put my iMac to sleep, I should turn the keyboard and trackpad off? isn't there an automatic power saving?
When my iMac is in sleep mode, the keyboard, trackpad and magic mouse go into some sort of energy saving mode too, right? (to preserve battery life)
I just got an iMac and I've been super curious as to how long the batteries last in the Magic Mouse. A month, eh?