Time Machine backup fails on external HD when sleeping

Hello,
I have recently purchased a MBPw/RD and also purchased a WD My Passport for MAC to use with Time Machine. The reason that I purchased this drive is for the hardware encryption feature of the drive. Time Machine completes without error when the computer is not sleeping but after TM is scheduled to run during sleep I get a message in console that shows the following.
4/11/13 3:36:04.994 AM com.apple.backupd[1924]: Error determining directory contents for /Volumes/My Passport for Mac: Error Domain=NSCocoaErrorDomain Code=256 "The file “My Passport for Mac” couldn’t be opened." UserInfo=0x7f9ada808160 {NSFilePath=/Volumes/My Passport for Mac, NSUserStringVariant=(
    Folder
), NSUnderlyingError=0x7f9ada8081d0 "The operation couldn’t be completed. (OSStatus error -36.)"}
I have the hardware encryption enabled on the drive and have selected that the key be stored in my Keychain so that when i log on to this computer the drive will be accessible. I have tested that feature and it works. It just does not write to the drive when it awakes from sleep. I have read for two days on these forums and have tried a few suggestions that I thought may have worked but they didn't. I am also new to MAC. Are there any suggestions that someone can give me to resolve this issue?
Thanks    

After reviewing the console i notice an entry before the backup which reads the following:
4/11/13 3:05:31.981 AM com.apple.time[11]: Requesting maintenance wake [Backup Interval]: <date: 0x7f9661d0a860> Thu Apr 11 03:21:41 2013 CDT (approx)
Maybe it was not asleep, I don't know at this point. I will try to contact WD support, hopefully their MAC division is not anything like their PC faction.

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