My PCs stay on 24/7 so I don't have that issue. But charging from a USB port on a computer that goes to sleep or shuts down then begins to drain power from the ereader.
Most of us have found that we already have an AC charger that works fine with the Sony's, usually from cell phones (for myself, my LG Rumor Touch's charger works perfectly, there's a thread around here where people have posted what works, as well as purchasing other AC chargers).
But if charging off the Wii is working fine for you, that's the way to go rather than charging off a PC or laptop/netbook that might shut down while the reader is still connected.
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