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From what I heard from the RendezVous, the Cybook is put in a state in "sleep mode" where the only way it could drain less battery is completly off.
On "standard" computer sleep and standby is normaly the same mode, ie CPU at lowest consumption, HD/DVD and other peripherals at the lowest consumption, and RAM in a special mode that will retain informations without need of an external device (Self Refresh mode)
The only mode that can go further than standby is "herbernation", unlike the standby mode, the RAM content is stored on a fixed drive (like a HD or anything else) and then the computer is turn off, and the next boot is a special one, where it read the special file on the HD and restore the RAM content.
By seeing the time the PRS505 and 700 turn back "on" from the "standby mode" it doesn't look like they use such a thing.
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