Keep USB ports powered when PC off

Hi,
I got my first iMac a few days ago and am missing a feature that my PC had. I have a razor mamba wireless mouse that charges in its own dock via USB. I would also like to charge my iPhone 4 from my iMacs USB ports over night. But when I turn off my iMac the USB ports power down, unlike my PC where the USB ports would remain active and charge my mouse over night.
Is there any way I can charge my USB components overnight without leaving the iMac on?

Hi AlmightySi
Welcome to Apple Discussions
A Self-powered USB Hub or Computer Sleep, an iMac can sleep 24-7 for weeks without a problem.
Dennis

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