Quote:
Originally Posted by HarryT
"Why" is very simply because the device is still running - all you've done is to blank the screen and lock most of the button. The operating system is still running; the CPU and memory are still consuming power. Not much, to be sure, but a small amount.
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In sleep, the OS is not running. It's in a sort of 'frozen' state waiting for something to wake it up. The CPU and RAM still draw a little bit of power since the CPU is waiting for the wake signal, and both the CPU and RAM need to keep the contents of memory stable.
If the OS was running during sleep, the battery would be drained in a day or two.