Really? I don't think so. It won't "sleep" - whatever that may be - in screensaver mode either. After some amount of inactivity the CPU will throttle its speed, but that's it. And that's independent of the screensaver, I think. But I don't think that there is a measurable difference in energy consumption between screensaver on and screensaver off.
The screensaver is rather a privacy enhancing optical thing. And makes people ask "what's that device, is it switched on" etc., so you can do the advertising for ebook readers :-)
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