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you can run any command programmatically from a system application; 'sleep' just means the hardware is in a low-power state, i.e., the usb subsystem is powered off, the soundcard is powered off (this part is VERY annoying), the display is powered off, the radio transmitters are off, and the processor is in its lowest power state. software may be (and is!) still running in main memory. in theory, the device could be in a standby to memory or standby to disk state, but i don't think the kindle uses these features of the linux kernel (they're high latency).
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