Battery Drain - iMAC in sleep mode

I hooked up my 16g iPOD Touch to our iMAC, (USB connection) left it alone for a few hours-all set right? Came back to use the Touch and noticed the battery was drained. So I plugged it in again. The indicator shows it is charging, so cable is fine. I am thinking that when the iMAC goes to sleep it stops charging. If so, that bites but I understand. But why would it drain so fast? The Touch was half charged this past test and down to 20% in no time. Nothing running on the Touch.
Don't remember reading anything saying the USB port dies when in login mode or sleep. Usually don't charge it with this MAC, so sorry if this is an old problem. Usually use my MACBook or AC to charge.
Would you agree it's a sleep issue doing the battery drain?
Thanks

Yes, it because the compute is asleep.

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    ==========                ======              =======                                                                    ========  =====    
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    ==========                ======              =======                                                                    ========  =====    
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    ==========                ======              =======                                                                    ========  =====    
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    Hi Marvin,
    Welcome to Lenovo Community!
    I’m sorry to hear that you are facing the issue with battery drain on ThinkPad T440s.
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    Please check the below image for further assistance on the option.
    Spoiler (Highlight to read)
    Spoiler (Highlight to read)
    Spoiler (Highlight to read)
    This setting might resolve the issue.
    Hope this helps. Do post back if issue persists!
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    Hemanth Kumar
    Did someone help you today? Press the star on the left to thank them with a Kudo!
    If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.
    Follow @LenovoForums on Twitter!

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      Apparaatnaam:          bq20z451
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      PCB Lot Code:          0
      Firmwareversie:          511
      Hardwarerevisie:          3
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