> On some devices, like the Sony Erricson Experia, if I long press the power
> button, I get a UI menu, with a sleep mode option.
>
> What would be the difference between that sleep mode and the screen-off
> sleep mode?
Nothing. That option is in the menu in case you accidentally
long-pressed the power button instead just pressing it.
> On screen-off, i.e. when it hits the sleep mode, are the wifi radios and CPU
> disabled/switched-off?
The CPU stops running.
WiFi behavior will vary by device and user preference. This was
discussed recently:
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